explain why alveoli in the lungs have large surface area and many blood the capillaries surrounding them
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Answer:
Explanation:
An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly. The alveoli have a very large total surface area and a very good blood supply, provided by the dense network of capillaries that surround them.
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Explanation:
because we breath in ,the alveoli expand to take in oxygen . when you breathe out ,the alveoli shrink to expel carbon dioxide
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