11 Gas Exchange

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Last updated 10:26 AM on 6/8/26

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Features of gas exchange surfaces?

Large surface area, thin, moist, good blood supply, ventilation

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Function of alveoli?

Site of gas exchange

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What happens during inhalation?

External intercostals contract, diaphragm contracts, thorax volume increases, pressure decreases

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What happens during exhalation?

Muscles relax, thorax volume decreases, pressure increases

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Role of cilia and mucus?

Trap and remove pathogens and particles