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MHT CET Medical202623 April 2026Evening ShiftBiologyBreathing and Exchange of GasesActual

The partial pressure of oxygen of blood in pulmonary capillaries is ----(i)---- mmHg while in alveolar air it is -------(ii)----- mmHg.

Options

  1. Ai - 40 ; ii- 104
  2. Bi - 45 ; ii- 40
  3. Ci - 90 ; ii - 105
  4. Di - 95 ; ii - 125

Correct answer

A. i - 40 ; ii- 104

Step-by-step solution

The partial pressure of oxygen ( pO₂ ) in the alveolar air is 104 mmHg. The blood entering the pulmonary capillaries is deoxygenated blood, which has a pO₂ of 40 mmHg. Due to this partial pressure gradient, oxygen diffuses from the alveoli into the blood in the pulmonary capillaries. Thus, (i) is 40 and (ii) is 104 . Answer: i - 40 ; ii- 104

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