breathing allows large amount of oxygen to enter the blood. explain how breathing does this
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Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. ... Blood without oxygen returns through the veins, to the right side of your heart. From there it is pumped to your lungs so that you can breathe out the carbon dioxide and breathe in more oxygen.
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The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell. When oxygen passes into the bloodstream, carbon dioxide leaves it.
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