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

  • A
    $10$
  • B
    $16$
  • C
    $19$
  • D
    $4$

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Mammalian lungs have an enormous number of minute alveoli (air sacs). This is to allow:

Which of the following factors affect the rate of diffusion?

What is partial pressure? How is it represented?

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