Human Biology Unit 4

5. the process by which a cell self destructs by producing self destructive enzymes.
7. a world wide spread.
8. when someone gets a vaccine containing the antigen.
12. unusually high cases in a given area in a short period.
14. when neither the group or the researchers know which group is getting the drug or the placebo.
15. destroys by making anti bodies which cause cell lysis and marks the pathogen for phagocytosis.
16. prevents the growth of disease causing microorganisms.
18. causes vasodilation and increased permeability.
19. cell makes histamine.

1. this is mixed with a pathogen and it increases the antigenic response enhancing the immune system.
2. when someone gets the disease once and becomes immune to get it again.
3. a strict isolation imposed to prevent the spread of disease.
4. occurs occasionally in an area.
6. destroys pathogens by apoptosis.
9. two types cytotoxic T cells and helper T cells
10. proteins released by phagocytes.
11. when the majority of the population is immunised which protects people who are not immunised.
13. regular cases occurring in an area.
17. resists infection by a pathogen and destroys the pathogen if it invades the body.