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Bill is sick and he coughed up mucus on this lady's grocery cart. She doesn't know it yet but she will get sick when she touches her face and the mucus will be in her nose hair. Bacteria spreads very easily, even through skin.
Linda's immune system has been invaded by non-specific defense (a bacteria).
With the bacteria invading the immune system and multiplying, the specific defence turns to it's first responce, T-cells and B-cells. B-cells fight bacteria and viruses bu making Y-shaped protiens called antibodies, which are able to lock onto the surface of an invading cell and mark it for destruction by the "killer" T-cells.
Our lymphatic system carries white blood cells through your body. When you’re sick your lymph nodes are swollen, which means your immune system has kicked into high gear to get rid of infection.
Sometimes the bacteria are directly caught by phagocytes, which is a large white blood cell that contributes to immune defenses by ingesting microbes or foreign particles
Linda has been saved and she couldn't of done it without her super immune system.
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