Immune System story board
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This is Max. He is a regular human being constantly being attacked by viruses. His skin prevents many viruses from entering every second. They bounce off his skin preventing most from getting in.
However if the skin had blocked all the entry ways the human body would not be allowed to breathe, eat, or drink. So there are ways for viruses to get in. However acid, buggers, and lots more defenses block there way. But when they do get in the bloodstream they start multiplying. As they start multiplying the body notices and starts attacking these viruses. Some can go undetected for days until they start getting attacked by whats know as white blood cells die when the body makes antibodies to help them track the bad diseases
Antibodies are what help the white cells attack the virus and help special cells recognize the invader. They are created by B cells that remember viruses making sure the human body does not fall sick to the same strain of a disease 2 times. However it can take a long time for a B cell to recognize diseases and make antibodies for it which is why you can stay sick for days.
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