Lack of oxygen due to lack of oxygen entering the body. And by the decrease of molecular oxygen pressure (PO2 ) In the blood and occurs in the following circumstances:
A. At high altitudes where the pressure is low molecular air including oxygen.
B. Inhaling corrupt air contains a small amount of oxygen at sea level.
C. Rapid breathing surface.
D. Diseases of the lungs.
E. Congenital heart disease in which communication between the parties to the left and right heart.
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respiratory device