MICROANATOMY

Detailed explanation-1: -The endoplasmic reticulum in the muscle fiber is known as sarcoplasmic reticulum. It stores calcium ions which regulate the muscle contraction.

Detailed explanation-2: -Calcium storage Located within the SR is a protein called calsequestrin.

Detailed explanation-3: -The sarcoplasmic reticulum (SR) is a specialized form of the endoplasmic reticulum of muscle cells, dedicated to calcium ion (Ca2+) handling, necessary for muscle contraction and relaxation.

Detailed explanation-4: -Sarcoplasmic reticulum stores calcium ions and releases them into the sarcoplasm for the generation of action potential during muscle contraction. The binding of calcium ions to troponin removes the masking of active sites of myosin present on actin filaments.