The |spleen| is closely associated to both the circulatory and the lymphatic systems. It is an abdominal organ which lies between the bottom of the |stomach| and the |diaphragm|. It plays a role in the maintenance of ~blood~ volume, production of some types of |blood cells|, and recovery of material from worn out red |blood cells|. It is also involved in the removal of |blood cells| and bacteria from the ~blood~.
