plz tell me the answer tomorrow is my exam
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you have to write articles on these topics in hindi
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The heart is an organ that pumps blood throughout the body. Human circulatory system is responsible for the transport of materials inside the human body. The organs of the circulatory system are heart, arteries, veins and capillaries. It comprises four chambers:
Atria (upper chambers)
Ventricles (lower chambers)
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