what features should an exchange surface have? And why?
large surface area- it increases the substance exchange. Thin-shorter distance across which a substance has to diffuse. Diffusion gradient-concentration of the substance on one side must be different from the concentration on the other side.
the very largest volume of air you can move in and out of your lungs with one breath.
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explain how the alveoli are protected from drying out
they are tucked away inside the body, away from direct exposure to dry air. Cells secret a watery fluid that covers the cells lining the alveoli, keeping them moist.
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