As human being, oxygen is vital for our survival and to carry out our bodily biological functions such as producing energy also known as cellular respiration. …show more content…
During the process of diffusion, the oxygen from the alveoli sacs is picked up by the red blood cells in the blood of capillaries. It is because of the oxygen concentration being higher in the alveoli sacs and lower in the capillaries. Similarly, the carbon dioxide from the blood in the capillaries is transported into the alveoli cells because of the carbon dioxide concentration being higher in the blood and less in the alveoli cell. From the alveoli sacs, carbon dioxide is exhaled out of the body when the diaphragm relaxes allowing the lungs to