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(C) Forced deep breathing (hyperventilation) leads to an increased intake of $O_2$ and a significant decrease in the partial pressure of $CO_2$ $(PCO_

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Very little $CO_2$ in the blood

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(C) Forced deep breathing (hyperventilation) leads to an increased intake of $O_2$ and a significant decrease in the partial pressure of $CO_2$ $(PCO_2)$ in the blood.$CO_2$ is the primary chemical stimulus for the respiratory center in the medulla oblongata.When $CO_2$ levels drop significantly,the respiratory center is not adequately stimulated,leading to a temporary cessation of breathing (apnea).Once the tissues consume the excess $O_2$ and metabolic $CO_2$ levels rise again,the respiratory center is stimulated,and normal breathing resumes.

Forced deep breathing for a few minutes by a person sitting at rest may be followed by a temporary cessation of breathing. This is due to

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