What the only way to oxygenate blood?

The only way to oxygenate blood is through respiration. Respiration is the process of taking in oxygen from the air and expelling carbon dioxide. It is an essential process for all aerobic organisms, as it provides the oxygen that cells need to produce energy. Respiration occurs in the lungs, where oxygen from the air is diffused into the bloodstream and carbon dioxide is diffused out of the bloodstream.