One of the forms of Respiration, this is gas exchange in the lungs, between blood and air in the alucoli that came from the external environment. Oxygen diffuses from air inside alveoli, across the alveolar calls into blood capilariesw, oxygen binds to the hemoglobin in
red blood cells and is transported throughout the body. Cabon dioxide diffused and exhaled.
What is External (Pulmonary) Respiration?