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What is the job of the lungs?
To transfer oxygen to the blood and remove waste carbon dioxide from it.
What process happens in alveoli?
Gas exchange
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.
What are villi?
Tiny projections on the inside of the small intestine?
What is the purpose of villi?
They increase the surface area so that digested food is absorbed quickly into the blood.
What adaptations do villi have?
A single layer of surface cells.
A very good blood supply to maintain the concentration gradient.