MUSCLE PHYSIOLOGY

Detailed explanation-1: -The sarcomere is the fundamental unit of contraction and is defined as the region between two Z-lines. Each sarcomere consists of a central A-band (thick filaments) and two halves of the I-band (thin filaments).

Detailed explanation-2: -A sarcomere is the region from one Z line to the next Z line. Many sarcomeres are present in a myofibril, resulting in the striation pattern characteristic of skeletal muscle.

Detailed explanation-3: -A sarcomere is defined as the segment between two neighboring Z-discs and is composed of long, fibrous proteins such as myosin and actin [7].

Detailed explanation-4: -A sarcomere is defined as the distance between two consecutive Z discs or Z lines; when a muscle contracts, the distance between the Z discs is reduced. The H zone-the central region of the A zone-contains only thick filaments and is shortened during contraction.