B1 - Exchanging Substances
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Last updated 5:10 PM on 4/5/26
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6 Terms
1
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What is the job of the lungs?
To transfer oxygen to the blood and remove waste carbon dioxide from it.
2
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What process happens in alveoli?
Gas exchange
3
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What adaptations do alveoli have?
Large surface area (about 5m²) in humans.
A moist lining for dissolving gases.
Very thin walls.
A good blood supply to maintain the concentration gradient.
4
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What are villi?
Tiny projections on the inside of the small intestine?
5
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What is the purpose of villi?
They increase the surface area so that digested food is absorbed quickly into the blood.
6
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What adaptations do villi have?
A single layer of surface cells.
A very good blood supply to maintain the concentration gradient.
