Biology 9700 · AS & A Level · Carbohydrates and lipids

Carbohydrates and lipids — practice question

The surface tension in the liquid coating the alveoli pulls their walls inwards, so the alveoli could collapse. Which statements may account for how this is prevented?

  • A1 and 2
  • B1 and 3
  • C2 and 3
  • D3 only

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