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III.4.B. Secretin

It is produced in the duodenum and jejunum (the proximal section of the small intestine) S cells.

Its production is stimulated by duodenal mucosa at acidic pH (pH<4.5).

Its effects: bicarbonate (HCO3-) release from the pancreas (for the neutralization of acid),

liver function ↑,

gastric acid release ↓,

stomach and duodenum motion ↓,

CCK effect ↑.