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WBI11/01Biology · Unit 13 (b)(3)

Explain how oxygen moves from the alveoli into the blood.

Oxygen diffuses from the alveoli into the blood, down a concentration gradient. The alveoli have a large surface area and thin walls, and blood flow keeps the gradient steep.

  • diffusion, down a concentration gradient1
  • large surface area of alveoli / thin walls1
  • gradient maintained by blood flow1
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