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

Movement into and out of cells — practice question

Within the lungs, oxygen and carbon dioxide move across cell membranes by diffusion. Which row is correct?

  • Anumber of cell membranes diffused through by oxygen from air: 3; carbon dioxide to air: 2
  • Bnumber of cell membranes diffused through by oxygen from air: 3; carbon dioxide to air: 2 or 3
  • Cnumber of cell membranes diffused through by oxygen from air: 5; carbon dioxide to air: 4
  • Dnumber of cell membranes diffused through by oxygen from air: 5; carbon dioxide to air: 4 or 5

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