Every time we breath, our lungs remove ......................
oxygen in the air and pass it .............. into our blood.each cell in the blood .................... need this oxygen to produce energy for life .............. if we run the race , we have to breathe .............much fast .this is because our muscle cells ....................... burn 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.
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