MUSCLE PHYSIOLOGY

Detailed explanation-1: -Skeletal muscle fibers are cylindrical, multinucleated, striated, and under voluntary control. Smooth muscle cells are spindle shaped, have a single, centrally located nucleus, and lack striations. They are called involuntary muscles.

Detailed explanation-2: -Cardiac muscle and skeletal muscle are both composed of sarcomeres. This layout gives both muscle types a striated appearance, alternating dark bands of myosin with lighter bands of actin. Only cardiac muscle has intercalated discs and skeletal muscle is the only type that is multinucleated.

Detailed explanation-3: -Skeletal muscles are composed of myofibrils, which in turn are composed of repeated units called sarcomeres. The skeletal muscles are formed by a process of myogenesis by the fusion of several uninucleate cells. Skeletal muscles are therefore multinucleate entities.