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16 March, 20:37

The alveoli are tiny air sacs in the lung. They have a relatively large surface area and thin walls. This structure allows -

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  1. 17 March, 00:22
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    Basically let's you breathe easier.

    Explanation:

    The alveoli are only one cell thick. Which allows relatively easy passage of oxygen and Carbon Dioxide between the alveoli and blood vessels. (Capillaries
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