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Hypoxemia (also spelled Hypoxaemia) is an abnormally low level of oxygen in the blood. [1] [2] More specifically, it is oxygen deficiency in arterial blood. [3] Hypoxemia is usually caused by pulmonary disease. Sometimes the concentration of oxygen in the air is decreased leading to hypoxemia.
Inhaled air rapidly reaches saturation with water vapour, which slightly reduces the partial pressures of the other components. Oxygen diffuses from the inhaled air to arterial blood, where its partial pressure is around 100 mmHg (13.3 kPa). [58] In the blood, oxygen is bound to hemoglobin, a protein in red blood cells.
An aquatic system lacking dissolved oxygen (0% saturation) is termed anaerobic, reducing, or anoxic. In water, oxygen levels are approximately 7 ppm or 0.0007% in good quality water, but fluctuate. [5] Many organisms require hypoxic conditions. Oxygen is poisonous to anaerobic bacteria for example. [3]
Asphyxia or asphyxiation is a condition of deficient supply of oxygen to the body which arises from abnormal breathing. [3] [4] Asphyxia causes generalized hypoxia, which affects all the tissues and organs, some more rapidly than others.
Iron is involved in key bodily processes, including the transportation of oxygen in the blood. It also plays a central role in building energy and proteins, and it can be found in your red blood ...
[9] [10] [11] A liter of blood can dissolve 200 cc of oxygen gas, which is much more than water can dissolve. [ 9 ] After being carried in blood to a body tissue in need of oxygen, O 2 is handed off from the heme group to monooxygenase , an enzyme that also has an active site with an atom of iron. [ 9 ]
Ischemia or ischaemia is a restriction in blood supply to any tissue, muscle group, or organ of the body, causing a shortage of oxygen that is needed for cellular metabolism (to keep tissue alive). [ 3 ] [ 4 ] Ischemia is generally caused by problems with blood vessels , with resultant damage to or dysfunction of tissue i.e. hypoxia and ...
From Boeing's turbulence and a catastrophic hurricane, to Donald Trump's election victory, "Sunday Morning" host Jane Pauley looks back at key events of a year that was monumental.