Practice Corner MCQs

Question 1 of 110

1. Question

Consider the following four statements and select the correct option stating which ones are true \((\mathrm{T})\) and which ones are false (F).
(i) Proteins contribute \(6-8 \%\) of the blood plasma.
(ii) Plasma contains very high amount of minerals.
(iii) Plasma without the clotting factors is called serum.
(iv) Glucose, amino acids, lipids, etc., are also present in the plasma as they are always in transit in the body.
\(
\begin{array}{ccccc}
& \text { (i) } & \text { (ii) } & \text { (iii) } & \text { (iv) } \\
\text { (a) } & \mathrm{F} & \mathrm{F} & \mathrm{T} & \mathrm{T} \\
\text { (b) } & \mathrm{T} & \mathrm{F} & \mathrm{T} & \mathrm{T} \\
\text { (c) } & \mathrm{T} & \mathrm{T} & \mathrm{F} & \mathrm{F} \\
\text { (d) } & \mathrm{F} & \mathrm{F} & \mathrm{F} & \mathrm{T}
\end{array}
\)

a
b
c
d

Question 2 of 110

2. Question

The colour of plasma is

pale yellow
pale orange
bright orange
brick red

Question 3 of 110

3. Question

\(\mathrm{pH}\) of blood

is greater than 9
ranges between 7-8
is less than 7
none of these

Question 4 of 110

4. Question

Which of the following statements is incorrect?

Erythrocytes/RBCs are the least abundant of all the cells in blood.
The number of RBCs in adult man per \(\mathrm{mm}^3\) of blood is 5 to 5.5 million.
RBCs are formed in the red bone marrow in the adults.
RBCs are enucleated in most of the mammals.

Question 5 of 110

5. Question

What is the oxidation state of iron in haemoglobin?

\(\mathrm{Fe}^{-}\)
\(\mathrm{Fe}^{2+}\)
\(\mathrm{Fe}^{3+}\)
\(\mathrm{Fe}^{4+}\)

Question 6 of 110

6. Question

Which of the following is an agranulocyte?

Basophil
Neutrophil
Lymphocyte
Eosinophil

Question 7 of 110

7. Question

The life span of human granulocytic WBC is approximately

between 2 to 3 months
more than 4 months
less than 10 days
between 20 to 30 days

Question 8 of 110

8. Question

In a healthy adult man, the smallest type of leucocytes are

basophils
monocytes
eosinophils
lymphocytes

Question 9 of 110

9. Question

Find the correct descending order of the percentage proportion of leucocytes in human blood.

Neutrophils \(\rightarrow\) Basophils \(\rightarrow\) Lymphocytes \(\rightarrow\) Acidophils (Eosinophils) \(\rightarrow\) Monocytes
Monocytes \(\rightarrow\) Neutrophils \(\rightarrow\) Lymphocytes \(\rightarrow\) Acidophils \(\rightarrow\) Basophils
Neutrophils \(\rightarrow\) Lymphocytes \(\rightarrow\) Monocytes \(\rightarrow\) Acidophils \(\rightarrow\) Basophils
Lymphocytes \(\rightarrow\) Acidophils \(\rightarrow\) Basophils \(\rightarrow\) Neutrophils \(\rightarrow\) Monocytes

Question 10 of 110

10. Question

Which of the following match is correct?

a
b
c
d

Question 11 of 110

11. Question

Match the types of WBC listed in column I with the shape of nucleus given under column II. Choose the answer which gives the correct combination of alphabets of two columns.

\(
\begin{array}{|c|c|c|c|c|}
\hline & \text { Column I } & & {\text { Column II }} \\
\hline & \text { Type of WBC } & & \text { Shape of Nucleus } \\
\hline \text { a } & \text { Neutrophils } & \text { p } & \text { Kidney shaped } \\
\hline \text { b } & \text { Eosinophils } & \text { q } & \text { S-shaped } \\
\hline \text { c } & \text { Basophils } & \text { r } & \text { 3-5 lobes } \\
\hline \text { d } & \text { Monocytes } & \text { s } & \text { 2 lobes } \\
\hline & & \text { t } & \text { disc-shaped } \\
\hline
\end{array}
\)

\(\mathrm{a}=\mathrm{r}, \mathrm{b}=\mathrm{t}, \mathrm{c}=\mathrm{p}, \mathrm{d}=\mathrm{q}\)
\(\mathrm{a}=\mathrm{t}, \mathrm{b}=\mathrm{r}, \mathrm{c}=\mathrm{q}, \mathrm{d}=\mathrm{s}\)
\(\mathrm{a}=\mathrm{q}, \mathrm{b}=\mathrm{p}, \mathrm{c}=\mathrm{t}, \mathrm{d}=\mathrm{r}\)
\(\mathrm{a}=\mathrm{r}, \mathrm{b}=\mathrm{s}, \mathrm{c}=\mathrm{q}, \mathrm{d}=\mathrm{p}\)

Question 12 of 110

12. Question

Which statement is true for WBCs?

Non-nucleated
In deficiency, cancer is caused
Can squeeze through capillaries
Can squeeze through blood capillaries

Question 13 of 110

13. Question

Which of the following statements are incorrect ?
(i) Leucocytes disintegrate in spleen and liver
(ii) RBCs, WBCs and blood platelets are produced by bone narrow
(iii) Neutrophils bring about destruction and detoxification of toxins of proteins origin
(iv) Important function of lymphocytes is to produce antibodies.

(i) and (ii)
(i) and (iv)
(i) and (iii)
(ii) and (iii)

Question 14 of 110

14. Question

The life span of thrombocytes is

4 to 5 weeks
3 to 4 weeks
3 to 7 days
none of these

Question 15 of 110

15. Question

In the following table of human \(\mathrm{ABO}\) blood groups, fill up the blanks (i), (ii), (iii) and (iv) from the options given below.
\(
\begin{array}{|c|c|c|c|}
\hline \text { Blood group } & \text { Antigens on RBCs } & \text { Antibody in Plasma } & \text { Donor groups } \\
\hline \text { A } & \text { A } & \text { Anti-B } & \text { A, O } \\
\hline \text { B } & \text { B } & \text { Anti-A } & \text { B, O } \\
\hline A B & A B & \text { (ii) } & \text { A, B, AB, O } \\
\hline \text { O } & \text { (i) } & \text { (iii) } & \text { (iv) } \\
\hline
\end{array}
\)

i – Nil, ii – Nil, iii – Anti-A, B, iv – AB
i – Nil, ii – Nil, iii – Nil, iv – O
i – Nil, ii – Anti-A, B, iii – Nil, iv – O
i – Nil, ii – Nil, iii – Anti-A, B, iv – O

Question 16 of 110

16. Question

A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the doctor?

Blood group B
Blood group AB
Blood group O
Blood group A

Question 17 of 110

17. Question

Which of the following blood groups is a universal recipient in blood transfusion?

Group AB
Group B
Group A
Group O

Question 18 of 110

18. Question

Anti-A and Anti-B antibodies are not found in which of the following blood group?

AB
A
O
B

Question 19 of 110

19. Question

Clumping of RBC may occur when blood of one person is mixed with serum or blood of another person. This is due to

Antigen-antibody reaction
Antitoxin-antibody reaction
Antigen-antigen reaction
Antibody-antibody reaction

Question 20 of 110

20. Question

Blood of AB group cannot be given to B group patient because

patient has antibodies B
patient lacks antibodies B
patient lacks antibodies A
patient has antibodies A

Question 21 of 110

21. Question

A drop of each of the following is placed separately on four slides. Which of them will not coagulate?

Blood serum
Blood from pulmonary artery
Whole blood from pulmonary vein
Blood plasma

Question 22 of 110

22. Question

Which one of the following statements is correct with respect to the principle of safe blood transfusion?

The donor's red blood corpuscles should not contain antibodies against the recipient's serum.
The recipient's serum should not contain antigens against the donor's antibodies.
The recipient's serum should not contain the antibodies against the red blood corpuscles of the donor.
The recipient's red blood corpuscles should not contain antibodies against the donor's antigen.

Question 23 of 110

23. Question

Detection of blood groups is done by agglutinisation test using antiserum. According to this method, if the blood shows coagulation with

antiserum B, blood group is AB
antiserum B, blood group is B
antiserum A and B, blood group is O
antiserum A, blood group is O

Question 24 of 110

24. Question

As per the guidelines of the Indian Red Cross Society, which of the following persons is recommended for blood donation?

People not in good health, under the influence of alcohol or drugs
Ladies during menstruation, pregnancy and breast feeding
Healthy women but unwed and below the age of 35
Persons who are immunised with live vaccines

Question 25 of 110

25. Question

Rh factor was discovered by

Landsteiner and Weiner
William Harvey
Malpighi
none of these

Question 26 of 110

26. Question

In which of the following situations, there is a risk factor for children acquiring erythroblastosis fetalis?

Mother is Rh – ve and father is Rh -ve.
Mother is Rh – ve and father is Rh +ve.
Mother is Rh + ve and father is Rh +ve.
Mother is Rh + ve and father is Rh -ve.

Question 27 of 110

27. Question

Conversion of fibrinogen to fibrin is catalysed by

thrombin
prothrombin
thromboplastin
all of these

Question 28 of 110

28. Question

Which proteolytic enzyme induces lysis of fibrin during fibrinolysis?

Fibrin
Thrombin
Plasmin
Platelet factor VIII

Question 29 of 110

29. Question

Which of the following statements are correct?
(i) \(\mathrm{Ca}^{2+}\) is necessary for blood coagulation.
(ii) Coagulation in blood vessels is prevented during normal conditions by heparin.
(iii) Clotting of blood involves changes of fibrinogen to fibrin by thrombin.
(iv) Blood clotting involves a cascading process involving a number of factors present always in the active form.

(i), (iii) and (iv)
(ii) and (iv)
(i), (ii) and (iii)
(iii) and (iv)

Question 30 of 110

30. Question

Consider the following statements \((\mathrm{A}-\mathrm{C}\) ) each with one or two blanks.
(A) (1) are the most abundant cells \((60-65 \%)\) of the total WBCs and (2) are the least \((0.5-1 \%)\) among them.
(B) Platelets are cell fragments produced from (3).
(C) During clot formation, fibrins are formed by the conversion of inactive (4) in the plasma by the enzyme (5).
Which one of the following options, gives the correct fill-ups for the respective blank numbers from (1) to (5) in the statements?

(1)-Neutrophils, (2)-basophils, (4)-fibrinogens, (5)-thrombin
(3)-mast cells, (4)-thrombokinase, (5)-prothrombin
(3)-megakaryocytes, (4)-prothrombin, (5)-thrombin
(1)-Basophils, (2)-neutrophils, (3)-reticulocytes

Question 31 of 110

31. Question

Identify the components labelled (A-D) in the given flow chart of the blood clotting process.

A-Thromboplastin, B- Prothrombinase, C- Thrombin, D- Fibrinogen
A- Fibrinogen, B- Thrombin, C – Prothrombinase, D- Thromboplastin
A- Prothrombinase, B- Fibrinogen, C – Thromboplastin, D- Thrombin
A- Thrombin, B- Thromboplastin, C – Fibrinogen, D- Prothrombinase

Question 32 of 110

32. Question

Prothrombin, which helps in clotting of blood, is released by

monocytes
lymphocytes
erythrocytes
blood platelets

Question 33 of 110

33. Question

Prothrombin required for blood clotting is produced in

stomach
spleen
liver
pancreas

Question 34 of 110

34. Question

Read the following statements and select the correct option.
Statement 1: Prothrombin is essential for blood clotting.
Statement 2: Prothrombin is synthesised in the liver in the presence of \(\mathrm{Ca}^{++}\).

Both statements 1 and 2 are correct.
Statement 1 is correct but statement 2 is incorrect.
Statement 1 is incorrect but statement 2 is correct.
Both statements 1 and 2 are incorrect.

Question 35 of 110

35. Question

During the process of blood coagulation, vitamin \(\mathrm{K}\) helps in

the formation of thromboplastin
the conversion of fibrinogen to fibrin
the conversion of prothrombin to thrombin
the formation of prothrombin

Question 36 of 110

36. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|c|l|c|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Factor II } & \text { (i) } & \text { Thromboplastin } \\
\hline \text { B. } & \text { Factor III } & \text { (ii) } & \text { Prothrombin } \\
\hline \text { C. } & \text { Factor VIII } & \text { (iii) } & \text { Hageman factor } \\
\hline \text { D. } & \text { Factor XII } & \text { (iv) } & \text { Antihaemophilic globulin } \\
\hline
\end{array}
\)

A-(iii), B-(iv), C-(ii), D-(i)
A-(iv), B-(iii), C-(ii), D-(i)
A-(ii), B-(i), C-(iv), D-(iii)
A-(i), B-(ii), C-(iii), D-(iv)

Question 37 of 110

37. Question

Most of our cells are surrounded by

blood
fluid equivalent to seawater in salt composition
interstitial fluid
pure water

Question 38 of 110

38. Question

Which of the following statements is/are incorrect about lymph?
(i) Lymph is colourful as it has haemoglobin but no RBC.
(ii) It contains specialised lymphocytes which are responsible for the immunity of the body.
(iii) Lymph is an important carrier for nutrients and hormones.
(iv) Fats are absorbed through lymph in the lacteals present in the intestinal villi.

(i) only
(iii) and (iv)
(ii) and (iii)
(iv) only

Question 39 of 110

39. Question

Lymph nodes form

hormones
lymph
antigens
antibodies

Question 40 of 110

40. Question

The lymph serves to

return the interstitial fluid to the blood
return the WBCs and RBCs to the lymph nodes
transport \(\mathrm{CO}_2\) to the lungs
transport \(\mathrm{O}_2\) to the brain

Question 41 of 110

41. Question

Read the following statements and select the correct option.
Statement 1: Lymphatic capillaries are free and blind at one end.
Statement 2: Lymph does not flow in a circular manner.

Both statements 1 and 2 are correct.
Statement 1 is correct but statement 2 is incorrect.
Statement 1 is incorrect but statement 2 is correct.
Both statements 1 and 2 are incorrect.

Question 42 of 110

42. Question

Compared to blood our lymph has

plasma without proteins
more WBCs and no RBCs
more RBCs and less WBCs
no plasma

Question 43 of 110

43. Question

Which of the following statements is true for lymph?

WBCs + serum
Blood – RBCs and some proteins
RBCs + WBCs + plasma
RBCs + proteins + platelets

Question 44 of 110

44. Question

Fill the correct option for (i) and (ii).
Open circulatory system is present in (i) and (ii).

(i)-platyhelminthes (ii)-molluscs
(i)-arthropods (ii)-platyhelminthes
(i)-annelids (ii)-arthropods
(i)-arthropods (ii)-molluscs

Question 45 of 110

45. Question

Read the following statements and select the correct option.
Statement 1: The four-chambered heart is present in birds and crocodiles.
Statement 2: Birds have two separate circulatory pathways.

Both statements 1 and 2 are correct.
Statement 1 is correct but statement 2 is incorrect.
Statement 1 is incorrect but statement 2 is correct.
Both statements 1 and 2 are incorrect.

Question 46 of 110

46. Question

The given figure shows the vertical section of human heart. Identify the parts labelled as A to K.

(a) A-Aorta, B-Pulmonary vein, C-Pulmonary arteries, D-Left ventricle, E-Semilunar valves, F-Left auricle, G-Right auricle, H-Superior vena cava, I-Right ventricle, J-Tricuspid valves, K-Inferior vena cava
(b) A-Aorta, B-Pulmonary artery, C-Pulmonary veins, D-Left auricle, E-Bundle of His, F-Left ventricle, G-Right ventricle, H-Chordae tendineae, I-Right auricle, J-Sino-atrial node, K – Vena cava
(c) A-Aorta, B-Superior vena cava, C-Inferior vena cava, D-Right ventricle, E-Bundle of His, F-Right auricle, G-Left auricle, H-Pulmonary vein, I-Right ventricle, J-Sino-atrial node, K-Pulmonary artery
(d) A-Aorta, B-Superior vena cava, C-Inferior vena cava, D-Left ventricle, E-Semilunar valves, F-Left auricle, G-Right auricle, H-Pulmonary artery, I-Right ventricle, J-Tricuspid valves, K-Pulmonary vein

a
b
c
d

Question 47 of 110

47. Question

Which of the following is correct about human heart?

The volume of both atria > the volume of both ventricles.
The volume of both ventricles > the volume of both atria.
The volume of both atria = the volume of both ventricles.
Ventricles are upper chambers and atria are lower chambers in our heart.

Question 48 of 110

48. Question

Which of the following chambers of the heart has the thickest muscular wall?

Left atrium
Right atrium
Right ventricle
Left ventricle

Question 49 of 110

49. Question

Heart pumps blood more forcefully in older persons than younger ones due to

decrease in oxygen content of blood
decrease in elasticity of arteries
fall in nutrient content of blood
increase in elasticity of arteries

Question 50 of 110

50. Question

Pacemaker is situated in the

wall of right atrium
interauricular septum
interventricular septum
wall of left atrium

Question 51 of 110

51. Question

Read the following statements and select the correct option.
Statement 1: The SA node acts as pacemaker.
Statement 2: The SA node is located in the wall of the right atrium near the interatrial septum.

Both statements 1 and 2 are correct.
Statement 1 is correct but statement 2 is incorrect.
Statement 1 is incorrect but statement 2 is correct.
Both statements 1 and 2 are incorrect.

Question 52 of 110

52. Question

In which one of the following pairs, two terms represent the same thing?

Lymphocyte – Erythrocyte
Plasma – Serum
Mitral valve – Bicuspid valve
Atrioventricular node – Pacemaker

Question 53 of 110

53. Question

Read the following statements and select the correct ones.
(i) Nodal tissue is specialised cardiac musculature in human heart which has the ability to generate action potential due to an external stimuli.
(ii) Position of SAN – Right corner of right atrium.
(iii) Position of AVN – Right corner of left ventricle.
(iv) AV bundle continues from AVN.
(v) Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles.

(i) and (ii)
(i) and (iii)
(ii), (iv) and (v)
all of these

Question 54 of 110

54. Question

The given figure illustrates a section through the human heart.

Which labelled part represents the site for the generation of action potential in human heart?

A
B
C
D

Question 55 of 110

55. Question

Chordae tendineae are found in

ventricles of brain
ventricles of heart
joints of legs
atria of heart

Question 56 of 110

56. Question

The problem of electrical discontinuity caused in the normal heart by the connective tissue separating the atria from the ventricles is solved by

coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the bundle of \(\mathrm{His}\)
having the AV node that function as a secondary pacemaker
having an ectopic pacemaker
coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the vagus nerve

Question 57 of 110

57. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|c|l|r|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { RBC } & \text { (i) } & \text { Coagulation } \\
\hline \text { B. } & \text { Antibody } & \text { (ii) } & \text { Immunity } \\
\hline \text { C. } & \text { Platelets } & \text { (iii) } & \text { Contraction } \\
\hline \text { D. } & \text { Systole } & \text { (iv) } & \text { Gas transport } \\
\hline & & \text { (v) } & \text { Hypertension } \\
\hline
\end{array}
\)

A-(v), B-(i), C – (iv), D – (iii)
A- (ii), B – (iv), C – (iii), D – (i)
A- (iv), B – (ii), C – (i), D – (iii)
A- (iii), B – (v), C – (ii), D – (iv)

Question 58 of 110

58. Question

Blood enters the heart because muscles of the

atrium contracts
atrium relaxes
ventricle relaxes
ventricle contracts

Question 59 of 110

59. Question

During ventricular systole

oxygenated blood is pumped into the pulmonary artery and deoxygenated blood is pumped into the artery
oxygenated blood is pumped into the aorta and deoxygenated blood is pumped into the pulmonary vein
oxygenated blood is pumped into the pulmonary vein and deoxygenated blood is pumped into the pulmonary artery
oxygenated blood is pumped into the aorta and deoxygenated blood is pumped into the pulmonary artery

Question 60 of 110

60. Question

If due to some injury the chordae tendineae of the tricuspid valve of the human heart is partially nonfunctional, what will be the immediate effect?

The flow of blood into the aorta will be slowed down.
The 'pacemaker' will stop working.
The blood will tend to flow back into the left atrium.
The flow of blood into the pulmonary artery will be reduced.

Question 61 of 110

61. Question

The figure given below shows three stages in the cardiac cycle.

Which of the following sequences is correct regarding this?

2,3,1
1,2,3
2,1,3
3,1,2

Question 62 of 110

62. Question

A red blood cell, entering the right side of the heart passes through the following structures.
1. Atrioventricular valves
2. Semilunar valves
4. Right ventricle
3. Right atrium
5. SAN
Which of the following options represents the correct sequence?

\(2 \rightarrow 3 \rightarrow 1 \rightarrow 4 \rightarrow 5\)
\(3 \rightarrow 1 \rightarrow 5 \rightarrow 2 \rightarrow 4\)
\(3 \rightarrow 5 \rightarrow 1 \rightarrow 2 \rightarrow 4\)
\(5 \rightarrow 3 \rightarrow 1 \rightarrow 4 \rightarrow 2\)

Question 63 of 110

63. Question

What happens when the pacemaker becomes non-functional?

Only auricles contract rhythmically.
Only ventricles contract rhythmically.
Cardiac muscles do not undergo co-ordinated rhythmic movements.
Auricles and ventricles contract rhythmically.

Question 64 of 110

64. Question

In the given figure the durations of the events of the cardiac cycle are given. Identify these events and select the correct option.

A-Auricular systole, B-Joint diastole, C-Ventricular systole
A-Ventricular systole, B-Joint diastole, C-Auricular systole
A-Ventricular systole, B-Auricular systole, C-Joint diastole
A-Joint diastole, B-Auricular systole, C-Ventricular systole

Question 65 of 110

65. Question

Which of the following statement(s) regarding the cardiac system is/are correct?
(i) Human heart is an ectodermal derivative.
(ii) Mitral valve guards the opening between the right atrium and left ventricle.
(iii) SAN is located on the left upper corner of the right atrium.
(iv) Stroke volume \(\times\) Heart rate \(=\) Cardiac output.

(i) only
(i) and (ii)
(ii) and (iii)
(iv) only

Question 66 of 110

66. Question

In a cardiac output of \(5250 \mathrm{~mL}\) per minute, with 75 heartbeats per minute, the stroke volume is

\(60 \mathrm{~mL}\)
\(80 \mathrm{~mL}\)
\(55 \mathrm{~mL}\)
\(70 \mathrm{~mL}\)

Question 67 of 110

67. Question

Rate of heartbeat is determined by

Purkinje fibres
papillary muscles
AV-node
SA-node

Question 68 of 110

68. Question

Which one of the following is a matching pair?

Lub – Sharp closure of AV valves at the beginning of ventricular systole
Dub – Sudden opening of semilunar valves at the beginning of ventricular diastole
Pulsation of the radial artery – Valves in the blood vessels
Initiation of the heartbeat – Purkinje fibres

Question 69 of 110

69. Question

The longer heart sound is

lub
dub
both lub and dub are equal
sometimes (a) and sometimes (b)

Question 70 of 110

70. Question

‘ \(X\) ‘ is the rhythmic contraction and relaxation in the aorta and its main arteries. What is \(X\)?

Heartbeat
Heart rate
Pulse
Cardiac output

Question 71 of 110

71. Question

Which of the following is the diagrammatic representation of standard electrocardiogram (ECG)?

a
b
c
d

Question 72 of 110

72. Question

In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

S – Start of systole
T – End of diastole
P – Depolarisation of the atria
R-Repolarisation of ventricles

Question 73 of 110

73. Question

Examine the diagrammatic representation of standard ECG. Select an option with correct matching.

\(
\begin{array}{|l|l|l|l|}
\hline & \text { P-Wave } & \text { QRS complex } & \text { T-wave } \\
\hline \text { (a) } & \begin{array}{l}
\text { Repolarisation of the } \\
\text { atria }
\end{array} & \begin{array}{l}
\text { Repolarisation of the } \\
\text { ventricles }
\end{array} & \begin{array}{l}
\text { Depolarisation of the } \\
\text { atria }
\end{array} \\
\hline \text { (b) } & \begin{array}{l}
\text { Depolarisation of the } \\
\text { atria }
\end{array} & \begin{array}{l}
\text { Depolarisation of the } \\
\text { ventricles }
\end{array} & \begin{array}{l}
\text { Repolarisation of the } \\
\text { ventricles }
\end{array} \\
\hline \text { (c) } & \begin{array}{l}
\text { Repolarisation of the } \\
\text { ventricles }
\end{array} & \begin{array}{l}
\text { Repolarisation of the } \\
\text { atria }
\end{array} & \begin{array}{l}
\text { Depolarisation of the } \\
\text { ventricles }
\end{array} \\
\hline \text { (d) } & \text { Depolarisation of the ventricles } & \text { Depolarisation of the atria } & \text { Repolarisation of the atria } \\
\hline
\end{array}
\)

a
b
c
d

Question 74 of 110

74. Question

Which of the following statements is correct?

The T-wave in an ECG represents excitation of ventricles.
The sum of P and T waves in a given time period can determine the heartbeat rate of an individual.
The end of the P-wave marks the end of the systole.
In a standard ECG, a patient is connected to the machine with three electrical leads.

Question 75 of 110

75. Question

The given figure is the ECG of a normal human. Which one of its components is correctly interpreted below?

Complex QRS – One complete pulse
Peak T – Initiation of total cardiac contraction
Peak P and peak R together – Systolic and diastolic blood pressures
Peak P-Initiation of left atrial contraction only

Question 76 of 110

76. Question

In ECG, P-R interval corresponds to

time delay in AV node
SA nodal conduction time
increased ventricular contraction
time interval between onset of ventricular contraction

Question 77 of 110

77. Question

Read the following statements carefully.
(i) In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart.
(ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves.
(iii) The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.
(iv) The T-wave of ECG represents depolarisation of the ventricles.
Which of the above two statements are incorrect?

(i) and (iii)
(ii) and (iv)
(i) and (ii)
(iii) and (iv)

Question 78 of 110

78. Question

Which of the following parts of heart first receives deoxygenated blood?

Right ventricle
Left auricle
Right auricle
Left ventricle

Question 79 of 110

79. Question

Which of the following options represents correct systemic circulation in human being?

a
b
c
d

Question 80 of 110

80. Question

In which of the following points pulmonary artery is different from pulmonary vein?

Its lumen is broad.
Its wall is thick.
It has valves.
It does not possess endothelium.

Question 81 of 110

81. Question

Which of the following statements is incorrect?

Veins are typically larger in diameter than arteries.
Because of their small size, blood flows more rapidly in capillaries than in other parts of circulatory system.
Walls of arteries are elastic enabling them to stretch and shrink during changes in blood pressure.
Veins contain more blood than any other part of circulatory system.

Question 82 of 110

82. Question

Select the schematic diagram which properly represents pulmonary circulation in humans.

a
b
c
d

Question 83 of 110

83. Question

Which of the following sequences is truly a systemic circulation pathway?

Right ventricle \(\rightarrow\) Pulmonary aorta \(\rightarrow\) Tissues \(\rightarrow\) Pulmonary veins \(\rightarrow\) Left auricle
Right auricle \(\rightarrow\) Left ventricle \(\rightarrow\) Aorta \(\rightarrow\) Tissues \(\rightarrow\) Veins \(\rightarrow\) Right auricle
Left auricle \(\rightarrow\) Left ventricle \(\rightarrow\) Pulmonary aorta \(\rightarrow\) Tissues \(\rightarrow\) Right auricle
Left auricle \(\rightarrow\) Left ventricle \(\rightarrow\) Aorta \(\rightarrow\) Arteries \(\rightarrow\) Tissues \(\rightarrow\) Veins \(\rightarrow\) Right atrium

Question 84 of 110

84. Question

Given below are the figures of blood vessels. Identify them and select the correct option.

\(
\begin{array}{|l|l|l|l|}
\hline & \text { A } & \text { B complex } & \text { C } \\
\hline \text { (a) } & \text { Capillary } & \text { Vein } & \text { Artery } \\
\hline \text { (b) } & \text { Artery } & \text { Capillary } & \text { Vein } \\
\hline \text { (c) } & \text { Vein } & \text { Capillary } & \text { Artery } \\
\hline \text { (d) } & \text { Vein } & \text { Artery } & \text { Capillary } \\
\hline
\end{array}
\)

a
b
c
d

Question 85 of 110

85. Question

What is the nature of blood passing through blood vessels A, B, C and D respectively?

\(
\begin{array}{|l|l|l|l|l|}
\hline & \text { A } & \text { B } & \text { C } & \text { D } \\
\hline \text { (a) } & \text { Deoxygenated } & \text { Oxygenated } & \text { Deoxygenated } & \text { Oxygenated } \\
\hline \text { (b) } & \text { Deoxygenated } & \text { Deoxygenated } & \text { Oxygenated } & \text { Oxygenated } \\
\hline \text { (c) } & \text { Oxygenated } & \text { Oxygenated } & \text { Deoxygenated } & \text { Deoxygenated } \\
\hline \text { (d) } & \text { Oxygenated } & \text { Deoxygenated } & \text { Oxygenated } & \text { Deoxygenated } \\
\hline
\end{array}
\)

a
b
c
d

Question 86 of 110

86. Question

The given figure is of the circulatory system. Identify the labelled parts (A-D) from the list (i-vii).
(i) Pulmonary circulation
(ii) Systemic circulation
(iii) Superior vena cava
(iv) Inferior vena cava
(v) Aorta
(vi) Veins and venules
(vii) Arterioles and capillaries

\(
\begin{array}{|l|l|l|l|l|}
\hline & \text { A } & \text { B } & \text { C } & \text { D } \\
\hline \text { (a) } & \text { (v) } & \text { (iii) } & \text { (i) } & \text { (vii) } \\
\hline \text { (b) } & \text { (vii) } & \text { (iv) } & \text { (i) } & \text { (vi) } \\
\hline \text { (c) } & \text { (v) } & \text { (iii) } & \text { (ii) } & \text { (vii) } \\
\hline \text { (d) } & \text { (vii) } & \text { (v) } & \text { (i) } & \text { (vii) } \\
\hline
\end{array}
\)

a
b
c
d

Question 87 of 110

87. Question

In the given figure of the heart which of the labelled parts (1,2,3,4,5) carries oxygenated blood?

1, 2, 3 and 4
1 and 5
1 and 4
3 and 5

Question 88 of 110

88. Question

Right atrium receives blood from

pulmonary aorta
pulmonary veins
inferior vena cava only
superior and inferior vena cava

Question 89 of 110

89. Question

In the given figure, which blood vessel represents vena cava?

C
D
A
B

Question 90 of 110

90. Question

Arteries are best defined as the vessels which

supply oxygenated blood to the different organs
carry blood away from the heart to different organs
break up into capillaries which reunite to form a vein
carry blood from one visceral organ to another visceral organ

Question 91 of 110

91. Question

Carotid artery supplies

oxygenated blood to lungs
oxygenated blood to intestine
oxygenated blood to brain
none of these

Question 92 of 110

92. Question

All veins carry deoxygenated blood except

pulmonary vein
hepatic vein
hepatic portal vein
renal vein

Question 93 of 110

93. Question

In veins, valves are present to check backward flow of blood flowing at

atmospheric pressure
high pressure
low pressure
all of these

Question 94 of 110

94. Question

Which of the following statements is correct regarding veins?

Carry blood from an organ towards the heart
All veins carry oxygenated blood with single exception
Carry blood from heart towards the organ
All of these

Question 95 of 110

95. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|c|c|c|c|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Superior vena cava } & \text { (i) } & \begin{array}{l}
\text { Carries deoxygenated } \\
\text { blood to lungs }
\end{array} \\
\hline \text { B. } & \text { Inferior vena cava } & \text { (ii) } & \begin{array}{l}
\text { Carries oxygenated } \\
\text { blood from lungs }
\end{array} \\
\hline \text { C. } & \text { Pulmonary artery } & \text { (iii) } & \begin{array}{l}
\text { Brings deoxygenated } \\
\text { blood from lower part } \\
\text { of body to right atrium }
\end{array} \\
\hline \text { D. } & \text { Pulmonary vein } & \text { (iv) } & \begin{array}{l}
\text { Bring deoxygenated } \\
\text { blood from upper part } \\
\text { of body to right atrium }
\end{array} \\
\hline
\end{array}
\)

A – (ii), B – (iv), C – (iii), D – (i)
A – (iv), B – (i), C – (ii), D – (iii)
A – (iv), B – (iii), C – (i), D – (ii)
A – (iv), B – (i), C – (iii), D – (ii)

Question 96 of 110

96. Question

Consider the following four statements (i) – (iv) and select the correct option.
(i) Fish heart contains only oxygenated blood.
(ii) Closure of AV valves produces the second heart sound.
(iii) The vascular connection between the digestive tract and kidney is called hepatic portal system.
(iv) Purkinje fibres are nerve fibres present in the heart wall.

(i)-F, (ii)-F, (iii)-T, (iv)-F
(i)-F, (ii)-F, (iii)-F, (iv)-T
(i)-T, (ii)-T, (iii)-F, (iv)-T
(i)-T, (ii)-F, (iii)-T, (iv)-F

Question 97 of 110

97. Question

The rate of heartbeat is regulated by the integrated activity of inhibiting and accelerating effects occurring in which part of the brain?

Cerebellum
Diencephalon
Medulla oblongata
Pons varolii

Question 98 of 110

98. Question

Hormonal regulation of cardiac activity involves the hormones _____ and _____ secreted by the ______.

epinephrine, norepinephrine, cortex of adrenal glands
epinephrine, norepinephrine, medulla of adrenal glands
thyroxine, calcitonin, thyroid gland
aldosterone, corticosterone, cortex of adrenal glands

Question 99 of 110

99. Question

Which of the following statements is correct regarding neural regulation of cardiac activity?

The cardiac centre lies in medulla oblongata of brain.
Sympathetic nerve fibres accelerate the rate of heartbeat and parasympathetic nerve fibres retard the rate of heartbeat.
Sensory fibres extend from the receptors present in the walls of aortic arch, carotid sinuses and vena cava to the cardiovascular centre in medulla oblongata.
All of these

Question 100 of 110

100. Question

Which one of the following is correct for ‘atherosclerosis’

Constriction of arterial lumen reduces the blood flow
High blood plasma concentration of cholestero (LDL) is responsible for this condition
Cholesterol deposition at the inner wall of the artery
All of these

Question 101 of 110

101. Question

If the systolic pressure is \(120 \mathrm{mmHg}\) and diastolic pressure is \(80 \mathrm{~mm} \mathrm{Hg}\), the pulse pressure is

\(120 \times 80=9600 \mathrm{mmHg}\)
\(120+80=200 \mathrm{mmHg}\)
\(120-80=40 \mathrm{mmHg}\)
\(\frac{120}{80}=1.5 \mathrm{mmHg}\)

Question 102 of 110

102. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|l|l|l|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Heart failure } & \text { (i) } & \begin{array}{l}
\text { Heart muscle is suddenly } \\
\text { damaged by an inadequate } \\
\text { blood supply }
\end{array} \\
\hline \text { B. } & \text { Cardiac arrest } & \text { (ii) } & \begin{array}{l}
\text { Chest pain due to } \\
\text { inadequate } \mathrm{O}_2 \text { reaching } \\
\text { the heart muscles }
\end{array} \\
\hline \text { C. } & \text { Heart attack } & \text { (iii) } & \text { Atherosclerosis } \\
\hline \text { D. } & \begin{array}{l}
\text { Coronary } \\
\text { artery disease } \\
\text { (CAD) }
\end{array} & \text { (iv) } & \begin{array}{l}
\text { Heart not pumping blood } \\
\text { effectively enough to meet } \\
\text { the needs of the body }
\end{array} \\
\hline \text { E. } & \begin{array}{l}
\text { Angina } \\
\text { pectoris }
\end{array} & \text { (v) } & \text { Heart stops beating } \\
\hline
\end{array}
\)

A-(iv), B-(v), C-(i), D-(iii), E-(ii)
A-(v), B-(iv), C-(i), D-(iii), E-(ii)
A-(iv), B-(v), C-(i), D-(ii), E-(iii)
A-(v), B-(iv), C-(ii), D-(iii), E-(i)

Question 103 of 110

103. Question

During acute myocardial infarction, which of the following changes occurs in the ECG ?

Flattened T wave
Depressed S-T segment
Elevated S-T segment
Increased length of PQ interval

Question 104 of 110

104. Question

Which one of the following statements is correct regarding blood pressure?

\(120 / 80 \mathrm{mmHg}\) is considered high and requires treatment.
\(100 / 55 \mathrm{mmHg}\) is considered an ideal blood pressure.
\(105 / 50 \mathrm{mmHg}\) makes one very active.
\(190 / 110 \mathrm{mmHg}\) may harm vital organs like brain and kidney.

Question 105 of 110

105. Question

Refer to the given electrocardiogram and select the correct statement.

It shows electrocardiogram of a healthy person.
It shows partial blockage due to damaged AV nodes.
It shows complete blockage and there is no synchrony between atrial and ventricular activities.
It shows that muscles of the heart are weak.

Question 106 of 110

106. Question

Excessively high heart rate (>180) can reduce cardiac output because

blood is moving too fast through the lungs to pick up enough oxygen
it tires out the heart muscles and so they pump slower
it reduces the time for ventricular filling which reduces stroke volume
the PR-interval increases which leads to longer ventricular diastole and shorter ventricular systole.

Question 107 of 110

107. Question

Lungs receive blood from right side of the heart, whereas the branching of systemic arteries result in a parallel pattern. What is the advantage of such of an arrangement?

It ensures that each of the peripheral organs and tissues receive only a fraction of blood pumped by the left ventricle.
It allows for independent variation in blood flow through different tissues as their metabolic activities change.
It ensures that as blood flows through capillaries, some of the oxygen leaves the blood to enter cells.
Both (a) and (b)

Question 108 of 110

108. Question

The figure represents total period of one cardiac cycle i.e., 0.8 sec and A, B and C represent its stages. Identify A, B and C and select the correct statement regarding them.

During A, tricuspid and bicuspid valves open and blood flows from atria into the ventricles.
During B, bicuspid and tricuspid valves close producing first heart sound.
During C, the semilunar valves close producing second heart sound.
During B, the atria contract due to a wave of contraction by SA node.

Question 109 of 110

109. Question

Select the incorrect difference between open and closed circulatory system.

\(
\begin{array}{|c|c|}
\hline \begin{array}{l}
\text { Open circulatory } \\
\text { system }
\end{array} & \begin{array}{l}
\text { Closed circulatory } \\
\text { system }
\end{array} \\
\hline \begin{array}{l}
\text { a. Blood flows at high } \\
\text { pressure. }
\end{array} & \text { Blood flows at low pressure } \\
\hline \begin{array}{l}
\text { b. Exchange of } \\
\text { materials is direct. }
\end{array} & \begin{array}{l}
\text { Exchange of materials } \\
\text { occurs through tissue fluid. }
\end{array} \\
\hline \text { c. It is less efficient. } & \text { It is more efficient. } \\
\hline \begin{array}{l}
\text { d. Found in arthropods } \\
\text { and molluscs }
\end{array} & \begin{array}{l}
\text { Found in annelids and } \\
\text { chordates }
\end{array} \\
\hline
\end{array}
\)

a
b
c
d

Question 110 of 110

110. Question

What is the relationship between cholesterol with blood pressure?

It increases metabolic rate and in turn increases blood pressure.
It decreases metabolic rate and in turn increases blood pressure.
It deposits over the wall of arteries and decreases blood pressure.
It deposits in the arteries and increases blood pressure.

CLASS-XI BIOLOGY + NEET

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