MUSCLE PHYSIOLOGY

Detailed explanation-1: -Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights. Muscle contraction is often followed by muscle relaxation, when contracted muscles return to their normal state.

Detailed explanation-2: -Once the muscle fiber is stimulated by the motor neuron, actin, and myosin protein filaments within the skeletal muscle fiber slide past each other to produce a contraction. The sliding filament theory is the most widely accepted explanation for how this occurs.

Detailed explanation-3: -Muscular endurance is the ability of a muscle or group of muscles to repeatedly exert force against resistance for an extended period of time. Performing multiple repetitions of an exercise is a form of muscular endurance.