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Chemicals which are released at the synaptic junction are called
(b) Neurotransmitters are the brain chemicals that communicate information throughout our brain and body. They relay signals between nerve cells called as neurons. They are the chemicals that allow the transmission of signals from one neuron to the next across synapses. They are also found at the axon endings of motor neurons, where they stimulate the muscle fibres.
Potential difference across resting membrane is negative. This is due to the differential distribution of the following ions
(a) Potential difference across resting membrane is negatively charged. This is due to differential distribution of \(\mathrm{Na}^{+}\)and \(\mathrm{K}^{+}\)ions.
Resting membrane potential is maintained by
(c) The ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pumps (or ion pumps) which transport 3 \(\mathrm{Na}^{+}\)outward for every \(2 \mathrm{~K}^{+}\)into the cell.
The function of our visceral organs is controlled by
(b) Sympathetic and parasympathetic neural systems are the part of autonomic neural system. This system controls and coordinates the functions of visceral organs
Which of the following is not involved in Knee-jerk reflex?
(c) Brain is not involved in any reflex action (e.g., knee-jerk reflex) while the muscle spindle, interneuron, and motor neuron are the part of the reflex arch.
An area in the brain which is associated with strong emotions is
(c) The limbic lobe or limbic system, along with the hypothalamus, is involved in the regulation of emotions (e.g. excitement, pleasure rage, and fear) and motivation.
Mark the vitamin present in Rhodopsin
(a) The rods contain a purplish red protein called rhodopsin. It is a photosensitive compound in the eye that is composed of opsin (a protein) and retinal (an aldehyde of vitamin-A), whereas vitamin-B, C, and D are not directly related with vision.
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