NEET BIOLOGY

Detailed explanation-1: -The lactic acid needs to be oxidised to carbon dioxide and water later. The creation of lactic acid (which needs oxygen to be broken down) generates an oxygen debt that needs to be repaid after the exercise stops.

Detailed explanation-2: -During normal muscle movement, aerobic respiration occurs in the muscle as there is enough supply of oxygen to the muscle. While performing vigorous physical exercise, there is a deficiency of oxygen as it gets used up continuously. Due to low level of oxygen, anaerobic respiration occurs in the muscles.

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.

Detailed explanation-4: -During aerobic respiration, this lactic acid is further broken down into carbon dioxide and water. Oxygen is needed for this step to take place. When the body lacks the necessary oxygen to complete the process of respiration and eliminate the lactic acid, it is said to be in oxygen debt.