Immune System

Immunity : Immune System : Immune Function

The immune system helps your body fight infections and other diseases. It is made up of white blood cells and organs and tissues of the lymph system.
If we catch a cold, we come down develop a fever; this natural phenomenon is also by the immune system.
The immune system is very complex.

cellsofimmunesystem

[picB-01] Immune System

 

The human body is protected by 2 main types of immunity.

Innate immunity Innate immunity is the built-in protection present at birth that defends us from disease.
Skin and other tissues lining our body (such as the mucosal layer in the nose and mouth) form a barrier to keep invaders out.
White blood cells respond to invaders, such as bacteria and viruses, and remove or destroy them.
Acquired immunity Acquired immunity is the protection the body develops when it is exposed to certain diseases.
The first time the body encounters a bacterium, virus or other antigen, it learns to recognize its antigen. The next time it invades, the immune system remembers it, has a stronger reaction to it and can fight it off quicker.
Vaccines are based on acquired immunity. They contain small amounts of protein (antigen) from a disease-causing micro-organism. If that micro-organism ever invades the body, the immune system will recognize and fight it.