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.
Protein and the human body. The average human body is made up of 60% water, 17% fat and only 5% carbohydrate. Protein comprises a similar proportion of the body as fat at 17% and forms essential components of all body tissues structure such as cell membranes and genetic material and plays a major role in metabolic systems in the form of blood hormones, antibodies and enzymes.