The amount of oxygen your body needs is different and varies depending on the current human activity. Calculated that the average man in the time wypoczywający minutes inhaled approximately 3.75 l of air, or about 750 cm3 of oxygen, of which the combustion process is used about 1 / 3 of the gas. If the same man started to run before fleeing wdychałby dog up to 15 times more air and use more oxygen, which acceptance may be increased up to 30 times.
Due to the varying demand for oxygen, the lungs of human must be so constructed that if necessary, to quickly increase their volume, a large part in this play bubbles Lung. It also has to be maintained a balance between depth and speed of respiration and blood flow through the lungs.