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MCAT Question A Day - 8/3/13

Before depolarization of a muscle cell, where will calcium ions primarily be found?

A.  In extracellular fluid just outside the sarcolemma.
B.  In the axon endings of a motor neuron.
C.  In the intracellular fluid just inside the sarcolemma.
D.  In the sarcoplasmic reticulum.

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