White Blood cells are the most important part of your immune system, as their job is to destroy pathogens that try to invade your body. When they come across an invading microorganism, they have 3 lines of attack:
1) By Consuming Them: White blood cells can ENGULF foreign cells and DIGEST them.
2) Producing Antitoxins: They counter the effect of any poisons (toxins) produced by the invading pathogens.
3) Producing Antibodies: Every pathogen has unique molecules on the surface of its cells; no two pathogens have the same ones. These molecules are called pathogens.
When your wbc comes across a foreign antigen, they'll start to produce proteins called antibodies which lock on to and kill the invading cells. The antibodies produced are specific to that pathogen-they won't lock onto other pathogens.
Antibodies are then produced rapidly and flow around the body, killing all similar bacteria.
Some of the wbcs stick around in the blood after the pathogen has been fought off. These are called MEMORY CELLS. If the person is infected with the same pathogen again, these cells will remember it and immediately make antibodies to kill it.
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