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Regulation of respiration - class-XII

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Multiple Choice

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

  1. Too much $O _2$ in the blood
  2. Too much $CO _2$ in the blood
  3. Very little $CO _2$ in the blood
  4. Both too much $O _2$ and very little $CO _2$ in the blood
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