Homeostasis Breathing

In your lungs there are millions of tiny air sacs, each surrounded by many tiny blood vessels. This figure shows how O: 2 diffuses from the air in these air sacs to the blood in the surrounding blood vessels.: Then blood with O 2 is pumped by the heart through larger blood vessels to tiny blood vessels near each cell in your body. There, the O 2; diffuses from the blood into the cells. ................
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