The latent period of a muscle twitch involves the generation of action potentials and the release of calcium ions, which set the stage for subsequent contraction. During this time, the muscle fibers have not yet started to contract. This phase is essential for preparing the muscle for effective contraction. ;
During the latent period of a muscle twitch, action potentials are generated, and calcium ions are released, which prepare the muscle for contraction. This phase occurs before any visible contraction happens. The correct answer is A. Action potentials are taking place, leading to internal mechanical changes.
;