In cardiac muscle, phosphorylation of phospholamban by protein kinase A modulates:

A. Ca++ extrusion through the plasmalemmal Ca++ pump
B. Ca++ transport by SERCA
C. open probability of the ryanodine receptor
D. Ca++ affinity of troponin C
E. Ca++ extrusion through the Na+-Ca++ antiporter


ANS: B

Anatomy & Physiology

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