The immune system comprises organs, tissues, cells and molecules, which protect the body against pathogens.
Detailed description
The biological defense system can be separated into an innate and an adaptive part. The innate immune system developed early in the phylogeny of living things. The adaptive immune system adjusts to new or modified pathogens. Both parts collaborate closely. Moreover, the immune system can destroy abnormal or defective cells of the own body.
Munich, 14 March 2013. The human body is under constant attack from a multitude of different pathogens. Considering the frequency of these attacks from viruses and bacteria, we actually get sick
