unit 4

5. two types cytotoxic T cells and helper T cells
6. a localized defence mechanism at the site of injury e.g. cut in skin
7. a disease that is capable of being transmitted from one person to another by direct or indirect contact
8. white blood cell involved in the specific immune response multiplies when presented with a foreign antigen which matches its receptor
13. type of defence that is a barrier to prevent microbes entering the body e.g. skin, mucus and membrane
14. causes vasodilation and increased capillary permeability
15. the ability of the body to resist infection by a pathogen or destroy microbes
16. makes histamine

1. the process by which a cell self destructs by producing self destructive enzymes
2. destroys pathogen by phagocytosis and releases cytokines
3. a phagocyte first engulfs pathogen contains it in a vacuole then lysomes fuse with the vacuole releasing digestive enzymes which destroy the pathogen
4. destroys pathogen by apoptosis
9. chemical which attracts more phagocytes and natural killer cells
10. destroys by making antibody's which cause lysis and marks the pathogen for phagocytosis
11. type of defence that uses chemicals to destroy pathogens trying to invade the body e.g. tears, sweat and acid
12. an organism which can carry and transmit the disease causing pathogen without being infected themselves e.g. mosquitos