2. Explain in brief the mechanism of circulation of blood in human beings.
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the food taken into our body is converted into energy and then carbon dioxide is released.
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Explanation:
Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body's tissues through the aorta.
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