In lungs,the air is separated from the venous blood through:

  • A
    Squamous epithelium + endothelium of blood vessel
  • B
    Squamous epithelium + tunica media blood vessel
  • C
    Transitional epithelium + tunica external blood vessel
  • D
    None of these

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

$A$: 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.

How many layers are present in the diffusion membrane of the alveolus capillary?

What is the thickness of the diffusion membrane involved in the exchange of gases in the lungs?

The partial pressure of oxygen in the alveoli of the lungs is

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