S: (n) immune system (a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response)
S: (n) reticuloendothelial system, RES (a widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells)
S: (n) musculoskeletal system (the system of muscles and tendons and ligaments and bones and joints and associated tissues that move the body and maintain its form)
S: (n) reproductive system, genital system (organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring)