Q. What is the anoxia?
Anoxia is a situation in which there is no available oxygen in the cell without oxygen the respiratory chain stops there is no ATP production the cell does not obtain energy and dies.
Anoxia can be caused for instance, by pulmonary insufficiency (extensive pulmonary injuries, drowning, and so on.), by obstructions, deficiencies and halts in tissue circulation (atherosclerosis of the coronary arteries that irrigate the myocardium, tourniquets, heart arrest), by hemolysis (lysis of red blood cell) or hemoglobin diseases (anemias, fetal erythroblastosis), etc.