MUSCLE PHYSIOLOGY

Detailed explanation-1: -Muscle fatigue occurs when a muscle can no longer contract in response to signals from the nervous system. The exact causes of muscle fatigue are not fully known, although certain factors have been correlated with the decreased muscle contraction that occurs during fatigue.

Detailed explanation-2: -Muscle function loss is when a muscle does not work or move normally. The medical term for complete loss of muscle function is paralysis.

Detailed explanation-3: -Muscle use can quickly overwhelm the ability of the body to deliver oxygen. Muscle fibers must switch to anaerobic metabolism and produce lactic acid, at which point the muscle begins to fatigue. The difference between the amount of oxygen needed by the muscles and the actual amount present is called the oxygen debt.