In 2-3 complete sentences, identify the body system, and explain how it interacts with the body system that is responsible for gas exchange with the external environment.

The respiratory system is responsible for gas exchange with the external environment, primarily facilitating the intake of oxygen and the expulsion of carbon dioxide. It interacts closely with the circulatory system, which transports oxygen from the lungs to the body's tissues and carries carbon dioxide back to the lungs for exhalation. This collaboration ensures that cells receive the oxygen they need for metabolism and that metabolic waste, in the form of carbon dioxide, is efficiently removed.