regulate body temperature. sense small changes in the heart rate. transport nutrients to muscles. maintain oxygen levels in the blood.
I gave my students this multiple choice question: While running, leg muscles work to move leg bones, and the skin helps to

Only one answer is correct among these 4 choices:
- regulate body temperature.
- sense small changes in the heart rate.
- transport nutrients to muscles.
- maintain oxygen levels in the blood.

Could you tell me which one is correct?

regulate body temperature.