1. Viruses, Bacteria and the Immune System Vocabulary

2. pathogen
any organism that causes disease

3. virus
Pathogen that needs a host cell in order to survive

4. bacteria eubacteria archaebacteria
single-celled (unicellular) that can cause disease
eubacteria
archaebacteria
True bacteria
Found in soil and in intestines in animals
Have cell walls and flagella
Similar in shape and size to eubacteria
VERY different from eubacteria
Found in EXTREME environments
Thermophiles (temp)
Hot mud/geysers/arctic
Halophiles (salty)
Dead Sea
Methanogens (methane)
swamps

5. bacteriophage
virus that infects bacteria

6. toxin
any poison produced by an organism

7. parasite
an organism that lives on/in or near a host and causes harm to it

8. host
where parasites obtains what it needs

9. Infectious disease
A disease caused by a microorganism that enters the body

10. antibiotic
man- made chemical that destroys pathogens

11. AIDS
(Acquired Immunodeficiency Syndrome) – A disease of the immune system caused by a virus

12. vaccine
used to help prevent a specific disease. Usually contains a small amount of the dead or weakened virus or bacteria

13. homeostasis
ability of an organism to maintain a stable internal environment

14. barriers
Obstructs (blocks) something from entering.

15. Inflammatory response
Fluid and white blood cells leak from blood vessels into the area

16. Immune response
Cells react to each kind of pathogen to fight

17. antigen
molecule coming from outside the body that is capable of causing a response

18. antibodies
substances produced in human body, marks to destroy specific antigens