The Immune System's Cells

There are 4 main types of immune cells. They are Phagocytes, Macrophages, T Cells and B Cells.

Phagocytes- Phagocytes are always the first to the site of the infection. They carry a poison to use to attack the pathogens. Once the opponent is poisoned, the Phagocyte engulfs it and eats it.
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Macrophages- Macrophages are basically just huge Phagocytes. The Macrophages help if there are too many invaders for the Phagocytes to handle alone.

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T Cells- Created in the bone marrow, then go to mature in the thymus. T cells analyze the pathogens, and send a chemical message to the B Cells.
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B Cells- Created in the bone marrow, they then go to mature in the spleen. B cells create antibodies, which are then used to immobilize the pathogens.
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Fun Fat- Once the infection is immobilized by the antibodies, the Phagocytes and Macrophages come and eat the immobilized cells.