The '''spleen''' is an organ above the [[stomach]] and under the [[rib]]s on the [[human]] body's left side. It is about as big as a human's fist. The spleen is part of the [[lymph]]atic system, which fights [[infection]] and keeps body fluids in balance. The spleen contains white blood cells that fight germs, and also helps control the amount of [[blood]] in the body, and destroys old and damaged cells. | The '''spleen''' is an organ above the [[stomach]] and under the [[rib]]s on the [[human]] body's left side. It is about as big as a human's fist. The spleen is part of the [[lymph]]atic system, which fights [[infection]] and keeps body fluids in balance. The spleen contains white blood cells that fight germs, and also helps control the amount of [[blood]] in the body, and destroys old and damaged cells. |