Alveoli

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4 Terms

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What are alveoli

Air sacs in the lungs

2
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How many alveoli per lung

240 million

3
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What happens to diaphragm and rib cage during inhalation

Expands and contracts

4
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4 alveoli adaptations

One cell thick wall so short diffusion pathway

Well ventilated so higher Oxygen concentration in lungs

Large surface area so more diffusion space

Very good blood supply to maintain high concentration gradient