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(D) Step $1$: During intense physical activity like a marathon, the demand for energy in muscle cells increases significantly.Step $2$: When the suppl

Vedclass · Accepted Answer

Lactic acid.

Vedclass · Answer

(D) Step $1$: During intense physical activity like a marathon, the demand for energy in muscle cells increases significantly.Step $2$: When the supply of oxygen is insufficient to meet this demand, muscle cells perform anaerobic respiration.Step $3$: In this process, glucose is partially broken down into $Lactic \ acid$ instead of $CO_2$ and $H_2O$.Step $4$: The accumulation of $Lactic \ acid$ in the muscle tissues leads to muscle fatigue and painful cramps. Therefore, the correct option is $(D)$.

During a marathon, we sometimes experience painful contractions of leg muscles due to the accumulation of one of the following substances. This is:

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