Your skin, hairs and mucus stop a lot of microorganisms getting inside your body. Platelets (small fragments of cells) help blood clot quikcly to seal wounds, if there is a low number of platelets it will clot slowly. The most important part is your white blood cells. They travel in your blood, when there is an ivading microbe they have three ways to destroy it.
1. White blood cells can engulf foreign cells and digest them.
2. Every cell has Antigens on the surface, if your white blood cells come across a foreign antigen is will produce proteins called antibodies which kill the invading cells. If a person is infection with the same Pathogen again, the white blood cells will quickly produce antibodies to kill it, because the person has become immune to it.
3. They produce antitoxins, the counter toxins are produced by the invading bacteria.
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