Secretin does not cause:

 # Secretin does not cause:

a) Bicarbonate secretion

b) Augments the action of CCK

c) Contraction of pyloric sphincter

d) Gastric secretion increase

The correct answer is D. Gastric secretion increase.

Secretin does not cause d) Gastric secretion increase.

Explanation:

a) Bicarbonate secretion: Secretin stimulates the pancreas to secrete bicarbonate to neutralize acidic chyme in the duodenum.

b) Augments the action of CCK: Secretin works synergistically with cholecystokinin (CCK) to enhance pancreatic enzyme and bile secretion.

c) Contraction of pyloric sphincter: Secretin promotes relaxation of the pyloric sphincter to allow chyme to pass into the duodenum.

d) Gastric secretion increase: Secretin inhibits gastric acid secretion and gastric motility to slow digestion in the stomach, making this the correct answer.