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In the respiratory system, it is the alveoli.

In the circulatory system, it's the capillaries.

They are similar in that both have walls that are only one cell thick, they are both the thinnest parts of their systems, and they are right next to each other. (They diffuse through to each other.)
In the respiratory system it's the Alveoli and in the circulatory system it's the capillaries :D

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9y ago
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9y ago

The biggest part of the respiratory system are the lungs, and this is the part of the body responsible for gas exchange.

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13y ago

Alveoli

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Q: What parts of the respiratory system function as the main sites of gas exchange?
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