Respiration, which means "breathe again", is very critical for life because it is necessary to supply all parts of the body with oxygen and to get rid of the produced carbon dioxide.

... Introduction Respiration, which means "breathe again", is very critical for life because it is necessary to supply all parts of de body with oxygen and to get rid of the produced carbon dioxide. When oxygen supply is too low, cells are unable to produce enough energy for normal functions. Also, when carbon dioxide is carried away inefficiently, its accumulation leads to acidosis. The process of respiration can be divided into five stages: * pulmonary ventilation; the movement of air in and out of the lungs * exchange of oxygen and carbon dioxide between the lungs and the blood in de pulmonary capillaries (external respiration) * the transport of the gases through the body by blood * exchange of oxygen and carbon dioxide between tissue cells and the blood in systemic capillaries (internal respiration) * utilization of oxygen and production of carbon dioxide by tissue cells (cellular respiration) The upper respiratory

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