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Regulation of respiration - class-XII
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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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A
Both too much $O _2$ and very little $CO _2$ in the blood
💡 Explanation:
Deep breathing rises the $O _2$ level of the blood. By excess formation of oxyhaemoglobin the acidity of blood increases. To control it, more of free $CO _2$ changes into bicarbonates and the free $CO _2$ level in the blood decreases. So due to lack of stimulant for inspiratory centre cessation of breathing takes place, after some time $O _2$ is consumed by the tissues and rise in $CO _2$ stimulates breathing again. So, the correct answer is 'Both too much O$ _2$ and very little CO$ _2$ in the blood'.