The cells began to divide.
— 2015-04-27The cells began to divide. How many human cells die daily? For adults it’s about 50-70 billion per day. Surprising?…
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. |
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