" cells, tissues, and organs that protect the body from disease. the immune system is composed of the white blood cells, bone marrow, thymus gland, spleen and other parts ??? ??? ??? #spleen# ..., Organ near the stomach that produces, stores, and eliminates blood cells ??? ??? ??? nervous system ..., the body's speedy, electrochemical communication system, consisting of all the nerve cells of the p" . . . . . .