Blood doping is a method used to enhance athletic performance by increasing the oxygen-carrying capacity of the blood.
The primary function of transporting oxygen from the lungs to the body's tissues is carried out by specific blood components.
To artificially boost oxygen transport, athletes may undergo procedures that increase their RBC count.
This is typically achieved by injecting additional Red Blood Cells into the bloodstream, thereby enhancing endurance and performance.
Therefore, Red Blood Cells are the blood cells injected for blood doping.