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The Immune System is an AIRPORT!
The walls around the airport/building hold everything in and act as a barrier
just like your skin!
A criminal/terrorist in an airport is just like a pathogen in your body, its something that isn't where it is supposed to be
Security Guards are just like Macrophages. They both stop suspicious things from entering. Macrophages protect your body while police protect the airport.
Helper T cells detect the pathogen and notify the rest of the immune system. Airport workers that do security checks are like the helper T cells of the airport
The B cells act as holding cells while the macrophage comes