Mathematics, 17.03.2020 16:32 oliviaprejean18

When a person exercises, the cells of the body need more oxygen. this is achieved by the system increasing the amount of oxygen that is supplied to the blood and the system increasing the rate of delivery of the blood to the cells of the body.

A. digestive; circulatory
B. circulatory; digestive
C. respiratory; cardiovascular
D. cardiovascular; respiratory

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