Question

in pe today, you have a mile - long race. you are trying to win but your muscles are burning, and you feel as if your legs are going to give out. what happens in your body to help you get to the finish line first? using the __ system, your legs and arms are contracting to move you forward. the system brings in more oxygen for cellular respiration. the __ system transports this oxygen to your cells so atp can be made for energy. playing hard in pe, you dont

Explanation:

The muscular system is responsible for muscle contractions (legs and arms contracting). The respiratory system brings in oxygen (for cellular respiration). The circulatory system transports oxygen to cells (so ATP can be made).

Answer:

muscular; respiratory; circulatory