Hi, please help me...Oxygen diffuses through the alveoli and the capillaries into the blood. Carbon dioxide is diffused from the capillaries to the alveoli, up the bronchial tree, and out of the mouth.
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It's surrounded by networks of blood vessels called capillaries that also have thin walls. The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood. The carbon dioxide you breathe out is diffused from the capillaries to the alveoli, up the bronchial tree and out your mouth.
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In a process called diffusion, oxygen moves from the alveoli to the blood through the capillaries (tiny blood vessels) lining the alveolar walls. Once in the bloodstream, oxygen gets picked up by the hemoglobin in red blood cells. ... Blood rich in carbon dioxide then returns to the heart via the veins.
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