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

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
Expiration is the process of:
  • A
    Taking air in
  • B
    Inhalation
  • C
    Releasing CO2​
  • D
    Giving air out
✓

Answer

  1. Giving air out

Explanation:

During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out. 

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