Think about how your body reacts if you start exercising. How do the nervous, muscular, circulatory, and respiratory systems respond to an increased oxygen demand?
The circulatory system brings oxygen in the blood to the cell, The respiratory system puts blood into the blood, The muscular system allows the respiratory system to bring oxygen into the body. The nervous system causes most neurons to respond to hypoxia by decreasing their metabolic demand and thus their need to generate ATP through oxidative phosphorylation.
