Deoxygenated blood enters cappilary, Red blood cells flow through capillary, Air leaves with a higher concentration of CO2 and less Oxygen, Air enters with a higher concentration of oxygen and less CO2, Oxygenated blood leaves capillary, Bubble shape of alveoli increases surface area, Carbon dioxide diffuses into the alveoli, Oxygen diffuses into the blood.

N5 Bio Alveoli

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