Biology, 17.07.2020 08:01 Sushmitarai4934
Complete the passage to describe the function of the heart. The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. The upper chambers of the heart are called , and the lower chambers of the heart are called .
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Complete the passage to describe the function of the heart. The pumping of the heart involves the al...
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