A person who has done intensive exercise and | vedclass

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(B) During intensive exercise,the demand for $O_2$ by the muscles exceeds the rate at which it can be supplied by the respiratory and circulatory syst

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An oxygen debt

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(B) During intensive exercise,the demand for $O_2$ by the muscles exceeds the rate at which it can be supplied by the respiratory and circulatory systems.To meet this energy demand,muscles perform anaerobic respiration,leading to the accumulation of lactic acid.After exercise,the body continues to consume extra $O_2$ to metabolize the accumulated lactic acid and restore energy stores (like $ATP$ and creatine phosphate).This additional amount of $O_2$ required by the body to return to the resting state is known as an $O_2$ debt.

$A$ person who has done intensive exercise and lies down for rest,his heart beat fastens and is gasping for breath. He is said to have

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