The Respiratory System - Overview Define and list their functions. Pulmonary Respiration Definition: Pulmonary respiration involves the exchange of gases between the external environment and the lungs. Function: To supply oxygen to the blood and remove carbon dioxide from it Cellular Respiration Definition: Cellular respiration is the metabolic process by which cells generate energy by breaking down glucose, in the presence of oxygen, to produce carbon dioxide, water, and ATP. Function: To produce energy for cellular activities Purpose of respiratory Definition: During exercise, the demand for oxygen and the production of carbon system during exercise: dioxide both increase. Function: to increase oxygen intake and carbon dioxide expulsion to meet the heightened needs of muscles. Ventilation Definition: Ventilation is the process of moving air in and out of the lunges. Function: To facilitate gas exchange by refreshing the air in the lunges Diffusion Definition: Diffusion is the movement of gases like oxygen and carbon dioxide across the respiratory membrane. Function: To allow oxygen to enter the blood and carbon dioxide to exit it based on concentration gradients. Respiration Four Processes: AWN