NEET BIOLOGY

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: -Skeletal muscle stores Ca2+ in the sarcoplasmic reticulum (SR) and releases it to initiate contraction, but the concentration of luminal Ca2+ in the SR ([Ca2+]SR) and the amount that is released by physiological or pharmacological stimulation has been difficult to measure.

Detailed explanation-3: -The sarcoplasmic reticulum in the muscle fibers resembles a network of smooth endoplasmic reticulums. This Sarcoplasmic reticulum functions as a storehouse of calcium iron. Calcium ions are important for the contraction and relaxation of muscles.

Detailed explanation-4: -Calcium ions at rest are stored in the sarcoplasmic reticulum (SR) from which they are rapidly released upon the depolarisation of the sarcolemmal and transverse (T-) tubular membranes of the muscle cell.

Detailed explanation-5: -Ca2+ binds with the protein participating in muscle contraction to induce muscle contraction and is then reabsorbed into the sarcoplasmic reticulum via Ca2+ ATPase.