Question

In the parasympathetic nervous system which of the following is released?
(a) Epinephrine
(b) Norepinephrine
(c) Serotonin
(d) Acetylcholine

Answer 1

Hint: This is the chief neurotransmitter of the parasympathetic nervous system, that contracts smooth muscles, dilates blood vessels, increases bodily secretions, and slows the heart rate.

Complete answer:
 In the parasympathetic nervous system, acetylcholine is released which is a neurotransmitter. It is secreted by both pre- and postganglionic parasympathetic cholinergic neurons. The parasympathetic nervous system is responsible for stimulating the activities that are a curse during the rest phase of the body for example urination, digestion, defecation, etc. Their nerve fibers arise from the central nervous system.

Additional Information: -This acetylcholine is responsible for the body's rest and digestion response when the body is relaxed, resting, or feeding.
-Acetylcholine is basically undoing the work of sympathetic division after a stressful situation.
-The parasympathetic nervous system is one of the two divisions of the autonomic nervous system the other one is the sympathetic nervous system.
-The parasympathetic nervous system decreases the respiration and heart rate but it increases the rate of digestion.
-When the parasympathetic nervous system is activated, it finally produces a sense of calmness and relaxation within the mind and body.
-The sympathetic nervous system (SNS) releases hormones namely catecholamines that include epinephrine and norepinephrine to accelerate the heart rate.
-The epinephrine and norepinephrine are released by sympathetic postganglionic neurons (the adrenergic neurons).
-Serotonin is a vasoconstrictor amine neurotransmitter of the central nervous system.
So, the correct answer is 'Acetylcholine'.

Note: -The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate.
-People can learn how to trigger their parasympathetic nervous system to immediately reduce their sense of anxiety and stress.
 -The sympathetic preganglionic neurons release acetylcholine. This makes acetylcholine a common neurotransmitter of the peripheral nervous system.