Skin -Dead skin prevents anything coming or passing through. T cells have two different types helper cells and killer cells. They are named Tcells after the thymus.
Mucus-All opening in your body have mucus that traps pathogens. An average human body produses a bouta liter of mucs a day.
Bacteria- have these inside our tracts, They destroy pathogens. They have a wide veriety of shapes ranging from rods to cirular shapes
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