The signals for mucus release include
a) parasympathetic innervation
b) a variety of neuropeptides found in the enteric nervous system
c) cytokines from immunocytes

a) parasympathetic innervation

Explanation:

The parasympathetic system is characterized by having Acetilcoline(Ach) as neurotransmitter. It receptors are whether nicotinic receptors or muscarinic receptors.

When acetilcoline interacts with a muscarinic receptor in the nasopharingeal glands lead to secretion of mucus.

answer; increases;

answer///island,peninsula;