I’m assuming this is a question about breathing. When humans breath, they take in air (which is mostly oxygen) and then breath out mostly carbon dioxide. The oxygen that is taken in is absorbed through the alveoli in the lungs into the blood stream. The oxygen rich blood then goes to the heart and is circulated to the rest of the body when the oxygen is absorbed. We then exhale carbon dioxide in removed from the blood along with other gaseous metabolic waste, and is breathed back out.
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