Highly vascular ductless abdominal lymphoid organ that resembles a gland in organization but is closely associated with the circulatory_system, that plays a role in the final destruction of red blood cells, filtration and storage of blood, and production of lymphocytes.
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.