NEET BIOLOGY

Detailed explanation-1: -So, the correct answer is ‘Gastrin’.

Detailed explanation-2: -Vagus nerve fibers from the medulla stimulate the parasympathetic nervous system of the stomach which, in turn, stimulates gastric secretion (via parietal and G cells). This enhanced secretory activity brought on by the thought or sight of food is a conditioned reflex. It only occurs when food is desired.

Detailed explanation-3: -The process is controlled by a complex system of endocrine cells and neurons. Gastrin is the main hormone regulating gastric acid secretion, and is phylogenetically older than gastric acidity [8].

Detailed explanation-4: -Gastric acid secretion is regulated by three local hormones: acetylcholine, gastrin, and histamine. Of these three, acetylcholine has the largest effect. Parietal cells, G cells, and enterochromaffin-like cells are stimulated by acetylcholine released in response to vagus nerve simulation.