The formation of cross-bridges in the contractile process in skeletal muscle is
A) potassium binding to myosin.
B) calcium binding to tropomyosin.
C) calcium binding to troponin.
D) ATP binding to the myosin cross-bridges.

Question

Quizplus · Accepted Answer

The formation of cross-bridges in the contractile process in skeletal muscle is initiated by calcium binding to troponin, which moves tropomyosin out of the way and exposes the binding sites on actin for myosin to bind and form cross-bridges. Option A is incorrect because potassium does not play a role in the contractile process. Option B is incorrect because calcium binds to troponin, not tropomyosin. Option D is incorrect because ATP is needed for myosin to disconnect from actin during muscle relaxation, not for the formation of cross-bridges.

The Formation of Cross-Bridges in the Contractile Process in Skeletal