Which function involves the circulatory system working with the respiratory system?

A. Enabling cellular respiration

B. Lowering body temperature

C. Maintaining liver function

D. Stopping bacterial infection

The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart