👉 Reoxygenization is a process in which oxygen is introduced into an organism to help it breathe. This process occurs during respiration, where oxygen from the air enters the bloodstream and binds with hemoglobin in red blood cells to form oxyhemoglobin. Oxygen then diffuses into the body's tissues and organs, allowing for the production of energy and the transport of nutrients throughout the body. Reoxygenization is essential for various biological processes such as muscle contraction, heart function, and brain metabolism.