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Oxygen therapy is a type of treatment used by some patients with chronic obstructive pulmonary disease (COPD). COPD causes lung damage that can keep the lungs from being able to absorb enough oxygen. If the body does not have enough oxygen, it cannot function as well as it should.
Uptake of O2 from the air is the essential purpose of respiration, so oxygen supplementation is used in medicine. Treatment not only increases oxygen levels in the patient's blood, but has the secondary effect of decreasing resistance to blood flow in many types of diseased lungs, easing the work load on the heart.