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14 September, 02:20

A runner is three quarters of the way through a marathon. Which systems are working to maintain oxygen levels for the runner's muscles?

a. integumentary, excretory, nervous, endocrine

b. circulatory, excretory, nervous, endocrine

c. respiratory, excretory, nervous, endocrine

d. circulatory, respiratory, nervous, endocrine

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  1. 14 September, 02:26
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    The correct answer is D. circulatory, respiratory, nervous, endocrine

    The other systems mentioned in the first three examples don't maintain oxygen levels at that body strain level.
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