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22 January, 06:13

Sacs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the air

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  1. 22 January, 06:39
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    The answer is areoles
  2. 22 January, 06:43
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    Diffusion of oxygen into the blood takes place at the alveoli (air sacs). The air in the alveoli contains a lot of oxygen. The alveoli are very close to capillaries, which are small blood vessels. The blood in the capillaries has very little oxygen and has a lot of carbon dioxide.
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