The most important factor in decreasing the intracellular concentration of calcium ion after contraction is
A) active transport of calcium across the sarcolemma.
B) active transport of calcium back into the sarcoplasmic reticulum.
C) active transport of calcium into the synaptic cleft.
D) diffusion of calcium out of the cell.
E) diffusion of calcium into the sarcoplasmic reticulum.
Answer: B
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