In order for a muscle to contract,calcium ions released from the sarcoplasmic reticulum must bind to

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Quizplus · Accepted Answer

Calcium ions released from the sarcoplasmic reticulum bind to troponin, causing a conformational change that allows for the interaction between actin and myosin and the subsequent contraction of the muscle fiber. Tropomyosin is also involved in this process as it helps to regulate the binding of myosin to actin, but it does not directly bind to calcium ions. Myosin and actin are the contractile proteins themselves, but they cannot initiate contraction without the binding of calcium ions to troponin. ATP is also necessary for contraction, but it is not directly involved in the binding of calcium ions to troponin.

In Order for a Muscle to Contract,calcium Ions Released from the Sarcoplasmic