B3 1.4 Exchange materials - the lungs

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  • B3 1.4 Exchanging materials - the lungs
    • Certain features such as a large surface ares, short diffusion paths and steep concentration gradients increase the effectiveness of an exchange surface.
    • The alveoli are the air sacs in the lungs.
    • The lungs are adapted to make gaseous exchange as efficient as possible. They have many alveoli, which provide a large surface area with a good blood supply and short diffusion distances. The lungs are ventilated to maintain steep diffusion gradients.

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