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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases2 Marks
Question
How does diaphragm help in inspiration?
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Answer

  1. The contraction of diaphragm initiates inspiration, as it increases the volume of the thoracic chamber in the antero-posterior axis.
  2. Hence, the intra-pulmonary air pressure decreases to less than the atmospheric pressure; hence, air from outside moves into the lungs.

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