Inhaled oxygen is required for this to function?
Exhaled air - is the carbon dioxide that we breath out as a product of cellular respiration. Inhaled air is the oxygen we take in that is required for the process of cellular respiration. Along with the oxygen we take in are other elements such as Nitrogen, which we don't use and it doesn't harm us. It's just a by product of breathing.
The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
Inhaled air contains more oxygen than carbon dioxide and other gases. Exhaled air contains mostly carbon dioxide as the inhaled oxygen was used up to create energy. Waste carbon dioxide (and other unwanted gases) is then let out of the body and the cycle continues. :) Gas exchange Gas% in inhaled air% in exhaled airOxygen2116Carbon dioxide0.044Nitrogen7979