The partial pressure of oxygen in the alveolar air is

  • A
    $45\; mm\; Hg$
  • B
    $95\; mm\; Hg$
  • C
    $104\; mm\; Hg$
  • D
    $110\; mm\; Hg$

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What is correct at the alveoli?

The blood leaving the lungs has all its haemoglobin oxygenated. Why does it give up oxygen to the tissues?

What is the exchange of bicarbonate and chloride ions between $RBC$s and plasma called?

$A$: Diffusion of carbon dioxide is $20$ times faster than oxygen.
$R$: It is due to difference in partial pressure as well as solubility of diffusing gases.

Identify $X, Y, Z$ from the given figure representing the exchange of gases in the alveoli.

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