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MCAT Question A Day - 8/7/14 - Answer!

Which of the following is responsible for the spread of the cardiac action potential from one cardiac muscle cell to the next?

A.  gap junctions
B.  desmosomes
C.  tight junctions
D.  acetylcholine

A is correct. The cardiac action potential is spread from one cardiac muscle cell to the next via ion movement through gap junctions

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