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Respiration and Circulation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYRespiration and Circulation3 Marks
Question
Why is it difficult to hold one’s breath beyond a limit?
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Answer

  1. It is difficult to hold one’s breath beyond a limit because the pressure of oxygen and carbon dioxide in blood changes as one holds his breath.
  2. When the breath is held beyond a limit, the urge to breath becomes irresistible.
  3.  When the breath is held forever, body becomes starved of oxygen and person may fall unconscious and the instinct to breath would take over.

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