In parasympathetic nervous system which of the following is released?

Options

(a) epinephrine
(b) norepinephrine
(c) serotonin
(d) acetylcholine

Correct Answer:

acetylcholine

Explanation:

The parasympathetic nervous system acts by relesing a chemical substance,acetylcholine,at the terminal endings of the postganglionic parasympathetic fibres.The latter are,thus,cholinergic.All the preganglionic nerve fibres of both these systems are cholinergic.