Biology / Bio 3143 · Atom · ~20 seconds
Gas Exchange Surface Requirements
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An effective gas-exchange surface is thin, moist, and large relative to body size, since diffusion works only across short wet distances and exchange scales with area.
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Lung alveoli multiply surface area through millions of small sacs rather than one large chamber.
Watch for
A dry surface stops working — gases must dissolve in moisture before diffusing across it.