The exchange of gases in the alveoli of the lungs occurs through which process?

  • A
    Active transport
  • B
    Osmosis
  • C
    Simple diffusion
  • D
    Facilitated transport

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Which structure of the lungs is directly involved in $O_2 / CO_2$ exchange between air and blood capillary?

Identify $A, B$ and $C$ in the given diagram and choose the correct option accordingly.

The blood flowing towards the lungs contains more of which of the following compared to the blood flowing away from the lungs?

Maximum amount of oxygen is exchanged from the blood in the . . . . . . .

What is the percentage of oxygen in expired air (in $\%$)?

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