Question

the cardiovascular system works closesly with the _________ system, which takes up oxygen out of the air and makes it available for our cells to use

Answer 1

the answer is respiratory system

Answer 2

Hey there!

The answer is respiratory system. The lungs expand and take in air. The alveoli take in the air. The oxygen is sent to the body, and then is used for energy during a workout.

I hope this helps!