The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them.
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Answer:
Blood comes into the right atritum 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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