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MCAT Question A Day - 9/6/14 - Answer!

The function of gap junctions in the intercalated discs of cardiac muscle is to:

A.  anchor the muscle fibers together.
B.  insure that an action potential is spread to all fibers in the muscle network.
C.  control blood flow by selectively opening and closincapillaries.
D.  release calcium into the sarcoplasmic reticulum.

B is correct. Gap junctions allow for the spread of the action potential throughout the heart.