PATHOLOGY

Detailed explanation-1: -Parasympathetic stimulation evokes a copious flow of saliva. In contrast, sympathetic stimulation produces either a small flow, which is rich in protein, or no flow at all.

Detailed explanation-2: -All salivary glands are supplied by cholinergic parasympathetic nerves which release acetylcholine that binds to M3 and (to a lesser extent) M1 muscarinic receptors, evoking the secretion of saliva by acinar cells in the endpieces of the salivary gland ductal tree.

Detailed explanation-3: -Parasympathetic excitation causes the nerve endings to release acetylcholine, a neurotransmitter that acts on the salivary glands. The action of this neurotransmitter on the salivary glands primarily stimulates the secretion of water and ions [1, 2, 3].