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6 April, 10:31

The respiratory system and circulatory system work together to bring oxygen to cells. why do cells need oxygen?

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  1. 6 April, 10:57
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    Body cells use oxygen to transfer energy stored in food to a usable form. This process, which is called cellular respiration, allows the cells to harness energy to perform vital functions such as powering muscles (including involuntary muscles such as the heart).
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