EVERYDAY SCIENCE

Detailed explanation-1: -Sympathetic stimulation results in the release of noradrenaline, which acts upon alpha-and beta-adrenergic receptors. This results in the following effects: Decreased production of saliva by acinar cells. Increased protein secretion.

Detailed explanation-2: -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-3: -The sympathetic nerve supply produces predominantly thicker mucous saliva mainly by the sublingual and partly the submandibular glands. This may occur when in certain situations, fear, stress or anger are aroused.

Detailed explanation-4: -Most salivary glands also receive a variable innervation from sympathetic nerves which released noradrenaline from which tends to evoke greater release of stored proteins, mostly from acinar cells but also ductal cells.