Print. An orthopedic surgeon, or orthopaedic surgeon, is a surgeon who has been educated and trained in the diagnosis and preoperative, operative, and postoperative treatment of diseases and injuries of the musculoskeletal system. Orthopedic surgeons work closely with other health care providers and often serve as consultants to other physicians.
Reviewed October 2008. The immune system is composed of many interdependent cell types that collectively protect the body from bacterial, parasitic, fungal, viral infections and from the growth of tumor cells. Many of these cell types have specialized functions. The cells of the immune system can engulf bacteria, kill parasites or tumor cells, or kill viral-infected cells.
A healthy and responsive immune system fights the disease causing pathogens and micro organisms with the help of special cells and tissues. Immune system is made up of a system of cells and organs. Its primary function is to build resistance in the body and fight off diseases and infections. It detects the various disease causing agents and protects the body against their attack. The bone marrow, spleen, lymph nodes and thymus are some important organs of the immune system.