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Practice MCAT Question - Q131 - Answer!

Which of the following has both exocrine and endocrine functions?

A.  Stomach
B.  Small intestine
C.  Pancreas
D.  All of the above

The correct answer is (D). Gastric exocrine secretions: pepsinogen, HCl, mucous, and intrinsic factor (for vitamin B12 absorption); gastric endocrine secretion: gastrin. Intestinal exocrine secretions: digestive enzymes and enterokinase (for activating trypsinogen to trypsin); intestinal endocrine secretions: intestinal gastrin, GIP, secretin and CCK. Pancreatic exocrine secretions: digestive enzymes and sodium bicarbonate; pancreatic endocrine secretions: insulin and glucagon.

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