MUSCLE PHYSIOLOGY

Detailed explanation-1: -Sarcomere. Sarcomere, repeating unit form myofibril. Myofibrils are essentially polymers, or repeating units, of sarcomeres. The shortening of the individual sarcomeres leads to the contraction of the individual muscle fibres, leading to muscle contractions..

Detailed explanation-2: -Myofibrillar and Sarcomeric Structure. Within myocytes, myofibrils are the most abundant organelle, occupying approximately 50–60% of the cytoplasm. Myofibrils are composed of overlapping thick and thin myofilaments organized into distinct, repeating units called sarcomeres.

Detailed explanation-3: -The filaments are organized into repeated subunits along the length of the myofibril. These subunits are called sarcomeres that are around three m in length. The muscle cell is nearly filled with myofibrils running parallel to each other on the long axis of the cell.