Calsequestrin in cardiac muscle:
A. acts as a high affinity Ca++ buffer in the cytosol
B. acts as a low affinity Ca++ buffer in the SR lumen, near the ryanodine receptor
C. promotes Ca++ accumulation by the mitochondria
D. increases the Ca++ affinity of the sarcolemmal Ca++ pump
E. facilitates myosin binding to the actin thin filament
ANS: B
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