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
Check The Sidebar For Another Practice MCAT Question!! ----->
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.
