"Excitation-contraction coupling" refers to the binding of energized myosin to actin.

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Quizplus · Accepted Answer

Excitation-contraction coupling refers to the process by which an action potential in a muscle cell leads to the contraction of that muscle cell, specifically the release of calcium ions from the sarcoplasmic reticulum and their binding to troponin, which then allows myosin to bind with actin and initiate muscle contraction. Energized myosin binding with actin is a part of the cross-bridge cycle within muscle contraction, but it is not specific to excitation-contraction coupling.

"Excitation-Contraction Coupling" Refers to the Binding of Energized Myosin to Actin