Hypoxic hypoxia occurs when there is a low concentration of oxygen in the inhaled air, which leads to a decrease in the amount of oxygen that diffuses into the blood and subsequently results in a reduced arterial oxygen partial pressure (PaO2). This type of hypoxia is primarily caused by conditions that affect the respiratory system, such as high altitude, lung disease, or respiratory failure. It is characterized by a decrease in the oxygen-carrying capacity of the blood, which can lead to tissue hypoxia if not corrected. Tissue hypoxia is a condition where the body's tissues do not receive enough oxygen to function properly. read more >>

Hypoxemia (or hypoxaemia in British English) is an abnormally low level of oxygen in the blood. More specifically, it is oxygen deficiency in arterial blood. Hypoxemia has many causes, often respiratory disorders, and can cause tissue hypoxia as the blood is not supplying enough oxygen to the body.read more >>