how does oxygen reach different parts of our body
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Explanation:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood.
A protein called haemoglobin in the red blood cells then carries the oxygen around your body. Blood without oxygen returns through the veins, to the right side of your heart.
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Answer:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body. ... Blood without oxygen returns through the veins, to the right side of your heart.
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