APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Gastrin-releasing peptide (GRP), a 14 amino acid peptide, is not a circulating hormone and is released from nerves to stimulate gastric G cells to secrete gastrin.

Detailed explanation-2: -Secretin has been identified as a hormone-regulating pancreatic exocrine secretion of fluid and bicarbonate, gastric acid secretion, and gastric motility [125, 126].

Detailed explanation-3: -Function. Gastrin is a 101 amino acid peptide that stimulates gastric acid secretion and also acts as a mitogenic factor for gut epithelial cells. Gastrin secretion is inhibited by gastric acid (Rehfeld, 2008).

Detailed explanation-4: -During meal ingestion, the main hormone responsible for stimulating acid secretion is gastrin, which acts primarily by releasing histamine from enterochromaffin-like cells.