Cellular respiration takes place after breathing. Cellular respiration is dependant upon breathing in most species. There is a great difference between the inputs and outputs of breathing and cellular respiration in reference to the ways oxygen and carbon dioxide are absorbed and released, according to Med-Health.net.
External respiration, or breathing, is the exchange of gases between respiratory organs and the environment, states Med-Health.net. In particular, it is the absorption of oxygen into the lungs and expulsion of carbon dioxide into the air. Internal respiration, or cellular respiration, is the exchange of gases between blood and cells. Specifically, oxygen is absorbed into the tissues and cells, while carbon dioxide is released into the bloodstream.
Simultaneous to the inhalation of oxygen and expulsion of carbon dioxide into the air, the exchange of gases in and out of the blood occurs. External respiration is a physical process during which oxygen is taken up by capillaries of lung alveoli, and carbon dioxide is released from blood, says Med-Health.net.
Internal or cellular respiration is a metabolic process in which oxygen is released to tissues and cells, and carbon dioxide is absorbed into the blood. The oxygen in the cell then goes through processes such as glycolysis, the citric acid cycle and the electron transport chain to produce amounts of adenosine triphosphate, which is a form of energy for the human body, explains About.com.