Lewis is running in a race. His muscles need oxygen. Which best describes how multiple systems interact to bring him into homeostasis?

The respiratory system takes oxygen into the lungs, where it enters the blood. The circulatory system then carries that oxygen to the muscles, which need it to keep working during the race. So the correct choice is “The respiratory system brings oxygen to the circulatory system, which delivers oxygen to the muscular system.”

AI-written and checked against the verified answer.