Which of the following contains site of attachment of calcium ions that initiates muscle contraction?: (A) Troponin I, (B) Troponin T, (C) Troponin C, (D) Myosin
Answer is C. Troponin T binds the troponin components to tropomyosin; troponin I inhibits the interaction of myosin with actin; and troponin C contains the binding sites for the Ca2+ that helps to initiate contraction.
Ganong 23 rd ed, pg 96