Macrophages - A “big eater” that ingests & cleans up disabled or dead cells., Dendritic Cells - Spies” that detect pathogens., T Helper Cells - Give instructions to other immune cells., B Cells - When stimulated by a particular antigen, these cells become antibody factories., Killer T Cells - Destroy pathogen infected cells by shooting an enzyme into them., Suppressor T Cells - Slow down or turn off the immune system to prevent damage to good cells., Antibodies - Attach to the specific antigen they were made for, disabling and marking pathogens for disposal., Bacteria - Single celled microscopic organisms that can be helpful or harmful., Neutrophils - First cells to leave the blood & fight incoming pathogens., Viruses - Basic microorganisms that are not living--they are genetic material wrapped in a protein coat., Antigens - Molecules from pathogens that appear on the surface of cells that have been invaded & cause the immune system to respond.,

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