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jacew749

Answer:

heart

Explanation:

Your heart is the only circulatory system organ. Blood goes from the heart to the lungs to get oxygen. The lungs are part of the respiratory system. Your heart then pumps oxygenated blood through arteries to the rest of the body.
Answer is the heart

There are four chambers of the heart, the left atrium and right atrium (upper chambers), and the left ventricle and right ventricle (lower chambers).

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