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The more little sacs you have, the more surface area there is - and more surface area means more spots for oxygen to enter the blood system.

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7y ago
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13y ago

larger surface area for gas exchange to take place, so it is more efficient

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9y ago

Greater surface area, there is more tissue to do gas exchange.

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Q: Why is it an advantage to have lungs with many smaller air sacs instead of fhavinf just two large air sacs?
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