Some of the key functions of protein involve energy production, transportation, boosting the immune system and replenishing body tissue. Proteins are some of the most essential nutrients for human beings, and they can be obtained from foods such as fish, chicken, eggs and beans.
In order for any human being to live a long and healthy life, he or she must be sure to take in sufficient amounts of protein. A lack of enough protein may lead to various complications including poor blood clotting, abnormal hair loss and organ failure.
One of the functions of protein is to replenish tissue that may be lost through natural processes or injury. If, for example, a person's skin is bruised, it is the proteins in the system that will be responsible for rebuilding the damaged area of the skin.
Another function of protein is to facilitate transportation of various substances through the human body system. For instance, the body uses protein to make hemoglobin which is the red matter of the cells used to carry oxygen to various areas.
The human immune body system helps fight infections and diseases that would otherwise cause death. This system is greatly made up of proteins which act as defense against dangerous organisms that may cause harm to the body.