ABSTRACT
Carbon dioxide (CO2) is normally present in the atmosphere in a concentration of 0.03 to 0.04 per cent by volume of dry air. is represents a partial pressure (PCO2) of 0.23 to 0.30 mm Hg. It is one of the products of metabolism of protein, carbohydrates and fats produced in the mitochondria in roughly the same volume as oxygen is consumed. For example:
Glucose (a carbohydrate) + oxygen = carbon dioxide + water + energy
(C6H12O6 + 6O2 = 6CO2 + 6H2O + energy)
e resultant CO2 has to be transported from the tissues by the circulation and eliminated by exhalation from the lungs.
