Impulses conducted along the transverse tubules of the muscle fiber stimulate the release of

Question

Quizplus · Accepted Answer

Impulses conducted along the transverse tubules stimulate the release of calcium ions from the sarcoplasmic reticulum, which then bind to troponin and cause tropomyosin to move and expose actin binding sites. This ultimately leads to the binding of actin and myosin and muscle contraction. ATP is not directly released during this process and acetylcholine is involved in the initial signal transmission at the neuromuscular junction, but not in the release of calcium ions.

Impulses Conducted Along the Transverse Tubules of the Muscle Fiber