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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
The partial pressure of oxygen in the alveoli of the lungs is
  • A
    equal to that in the blood
  • ✓
    more than that in the blood
  • C
    less than that in the blood
  • D
    less than that of carbon dioxide.
✓

Answer

Correct option: B.
more than that in the blood
b
(b) : The partial pressure of oxygen in alveolar air is $104\ mm\ Hg$ whereas it is $40\ mm\ Hg$ in deoxygenated blood and $95\ mm\ Hg$ in oxygenated blood.

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