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MCAT Question A Day - 9/8/14

During an action potential, a cardiac muscle cell remaindepolarized much longer than a neuron. This imost likely to:

A.  prevent the initiation of another action potential during contraction of the heart.
B.  ensurthaadjacent cardiac muscle cellwill contract at different times.
C.  keep thneuron from firing twice in rapid succession.
D.  allow sodium voltage-gated channelto remain open long enough for all sodium to exit the cell.

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