GENERAL HISTOLOGY

Detailed explanation-1: -In striated muscle, calcium causes a shift in the position of the troponin complex on actin filaments, which exposes myosin-binding sites (Fig. 2A). Myosin bound by ADP and inorganic phosphate (Pi) can then form cross-bridges with actin, and the release of ADP and Pi produces the power stroke that drives contraction.

Detailed explanation-2: -Calcium’s positive molecule is important to the transmission of nerve impulses to the muscle fiber via its neurotransmitter triggering release at the junction between the nerves (2, 6). Inside the muscle, calcium facilitates the interaction between actin and myosin during contractions (2, 6).