When muscle is stimulated directly to contract, does the rising phase of the twitch begin immediately? If not, why not?

Question

Quizplus · Accepted Answer

The rising phase of a muscle twitch does not begin immediately because there are necessary electrical and chemical changes at the muscle membrane that must occur first to initiate contraction. This includes processes such as the depolarization of the muscle cell membrane and the release of calcium ions, which are crucial for the contraction process to begin.

When Muscle Is Stimulated Directly to Contract, Does the Rising