Which of the following events happens during excitation-contraction coupling?

Question

Quizplus · Accepted Answer

During excitation-contraction coupling, the action potential triggers the release of calcium ions (Ca2+) from the sarcoplasmic reticulum, which then binds to troponin on the thin filaments, causing a conformational change that exposes the binding sites on actin and allows for the formation of cross-bridges with myosin. Therefore, Choice B is the correct option, as it describes the release of Ca2+ from the sarcoplasmic reticulum. Choices A and D are incorrect as they do not accurately describe the events that occur during excitation-contraction coupling. Choice C is incorrect as it describes the uptake of Ca2+ by the sarcoplasmic reticulum, which occurs during relaxation.

Which of the Following Events Happens During Excitation-Contraction Coupling