Gas exchange in the lungs

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    Laurafleetham

    Cards (2)

    • What are the alveoli?
      Small air sacs that are the site of gas exchange in the lungs
    • Adaptations of the alveoli:
      • RBCs are slowed as the pass through capillaries, allowing more time for diffusion
      • reduced distance between alveoli and RBCs
      • microvilli increase the surface area of the alveoli
      • steep concentration gradient
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