regulate body temperature. sense small changes in the heart rate. transport nutrients to muscles. maintain oxygen levels in the blood.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: While running, leg muscles work to move leg bones, and the skin helps to
Possibilities:
- regulate body temperature.
- sense small changes in the heart rate.
- transport nutrients to muscles.
- maintain oxygen levels in the blood.

regulate body temperature.