All of the following are true about excitation-contraction coupling in skeletal muscle except that: (A) Acetylcholine is released at the nerve terminal, (B) Ca2+ is released from sarcoplasmic reticulum during contraction, (C) Ca2+ is pumped back into sarcoplasmic reticulum during relaxation, (D) Ca2+ binds to tropomyosin to initiate muscle contraction
Answer is D. Ca2+ binds to troponin C (not Tropomyosin) to initiate muscle contraction. Ref: Ganong&;s Review of Medical Physiology 26th edition Pgno: 105