Orthopedic surgeons receive 5 or more extra years of training after school. 1  They specialize in the care of disorders of the bones, muscles, tendons, and ligaments. They are trained to manage joint problems with both operative and non-operative techniques.
What the Immune System Does. The immune (pronounced: ih-MYOON) system, which is made up of special cells, proteins, tissues, and organs, defends people against germs and microorganisms every day. In most cases, the immune system does a great job of keeping people healthy and preventing infections.
Lupus is an autoimmune disease that impacts the immune system. The immune system is like an organ in the body. It is made up of blood cells and lymph nodes as well as parts of the liver and the spleen. The immune system normally protects your body against invaders and infection using proteins called antibodies.