MICROANATOMY

Detailed explanation-1: -Ca2+ ions play an important role in muscle contraction by creating interactions between the proteins, myosin and actin. The Ca2+ ions bind to the C component of the actin filament, which exposes the binding site for the myosin head to bind to in order to stimulate a muscle contraction.

Detailed explanation-2: -Muscle contraction is known to be regulated by calcium. An action potential generated by a motor neuron propagates on the muscle cell surface, activates voltage-gated calcium channels and allows calcium flow into the muscle cell.

Detailed explanation-3: -Source of Ca2+ for muscle contraction is both sarcoplasmic (endoplasmic) reticulum as well as extracellular fluid in case of. a. Skeletal muscles.