The energy required to carry out various activities of the agency comes, ultimately, of breathing. This process involves the oxidation of food (mainly sugars and fats) with the aim of releasing energy. The lungs incorporate the oxygen needed for this process from the air, and it carries blood to tissues. Carbon dioxide produced as a result of respiratory activity of the tissues is transported into the lungs through the venous blood, and eliminated through the breath. The basic questions to which we must answer are: How enters and leaves the air in your lungs? How adjusts the volume of air breathed to the needs of the organism, "What are the limits of abstraction of oxygen in the lungs?
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