<prompt> All of the following are true about excitation contraction coupling except:Acetylcholine is released at the nerve terminalCalcium is pumped back into the sarcoplasmic reticulum during relaxationCalcium is released from sarcoplasmic reticulum during contractionCalcium binds to tropomyosin to initiate muscle contraction  <response>: Ans. d. Calcium binds to tropomyosin to initiate muscle contraction Calcium binds to Troponin C, not to the tropomyosin, to initiate muscle contraction. The calcium released into the cytosol binds to Troponin C by the actin filaments, to allow cross-bridge cycling, producing force and, in some situations, motion. 