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11 April, 15:00

Which part of the Human Body is more complex, your heart or your circulatory system? Explain your answer.

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  1. 11 April, 15:11
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    The heart is the key organ in the circulatory system. As a hollow, muscular pump, its main function is to propel blood throughout the body. It usually beats from 60 to 100 times per minute, but can go much faster when necessary.

    i got this answer from

    _heart and circulatory-KidsHealth
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