The respiratory and circulatory systems work together to sustain (1)____. The respiratory system is where occurs between the air in the alveoli and the blood in the capmaries. It picks up (3)_____ from inhaled air and expels (4)____ and water As the respiratory system initiates gas exchange within the body, the (5)____ circulates blood around to the body so that oxygen and nutrients can be (6)___ all the (7)_____ and carbon dioxide and other wastes can be removed. The circulatory system ensures that both delivery and clean-up occur by (8)_____ the blood through the body.​