Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

As it diffuses from an air space in an alveolus, through a cell in the capillary wall, and into a red blood cell, how many times does a molecule of carbon monoxide have to pass through a cell surface membrane?

  • A3
  • B4
  • C5
  • D6

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