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MCAT Question A Day - 7/2/13 - Answer!

Where on target cells would you expect to find receptor sites for the protein hormones insulin and glucagon?

A.  In the nucleus of the target cells
B.  On the outer membrane of the target cells
C.  In the Islets of Langerhans of the pancreas
D.  In the acinar cells of the pancreas

The correct answer is (B). Receptor sites for protein hormones are located on the outer membrane of target cells. Receptor sites in the nucleus (choice A) are for lipid hormones. The Islets of Langerhans (choice C) are where insulin and glucagon are made in the pancreas. Acinar cells (choice D) are where pancreatic digestive secretions are made.