Oxygenation is the process of adding oxygen to a substance, often referring to the way oxygen is supplied to the body. In humans, this occurs primarily in the lungs, where oxygen from the air is absorbed into the bloodstream. This oxygen is then transported to cells throughout the body, where it is used for energy production and other vital functions. In medical contexts, oxygenation can also refer to the measurement of oxygen levels in the blood. Tools like pulse oximeters are used to assess how well the lungs are delivering oxygen to the bloodstream. Proper oxygenation is crucial for maintaining overall health and supporting bodily functions.