Where does the diffusion of gases takes place?
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Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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the partial pressure of carbon dioxide capillaries is much higher than the alveoli.this means that net diffusion take place occurs into alveoli from capillaries.
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