Physiology General 4f9cdba4 Function of phospholamban is A Regulates Na+K+ B Transports calcium out of mitochondria C Collects calcium into sarcoplasmic reticulum D Binds actin with myosin High-Yield Explanation Phospholamban increases the activity of SERCA ↓ It causes accumulation of Ca2+ by sarcoplasmic reticulum ↓ It leads to Lusiotropic effect, Increase in rate of relaxation