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After several miles of running and sprinting in intervals, the runner’s muscles ache and feel fatigued. Which is the best explanation for what has occurred?

AThe runner's muscles have accumulated lactic acid.
BThe runner’s body has failed to perform cellular respiration.
CThe runner’s cells are relying completely on aerobic respiration.
DThe runner’s muscles have accumulated carbon dioxide.

Verified Answer :

Athe runner's muscles have accumulated lactic acid.

Answer: Option A

Explanation:

The aerobic respiration takes place inside the body when there is presence of oxygen in the body.

The product of aerobic respiration is carbon dioxide and water. This is a normal condition.

In case of exercises there is a lack of oxygen then anaerobic respiration takes place and end product of this respiration is ethyl alcohol and lactic acid.

The runner's muscle accumulate lactic acid in the muscles which causes pain.

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