Which of the following factors affect the rate of diffusion?

  • A
    Pressure gradient
  • B
    Solubility of gases
  • C
    Thickness of membranes
  • D
    All of these

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

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$(1)$ Atmospheric air enters: Inspiration :: Alveolar air released out: ..........
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