https://en.wikipedia.org/wiki/Spleen https://en.wikipedia.org/wiki/Spleen "The spleen plays very important roles in regard to red blood cells (erythrocytes) an

https://en.wikipedia.org/wiki/Spleen https://en.wikipedia.org/wiki/Spleen "The spleen plays very important roles in regard to red blood cells (erythrocytes) and the immune system. It removes old red blood cells and holds a reserve of blood, which can be valuable in case of hemorrhagic shock, and also recycles iron."