Key words and definitions

4. An unpleasant or unhealthy smell or vapour.
6. A heart monitor invented by Willem Einthoven in the early 1900’s
10. The Romans built these to transport fresh water to highly populated areas.
11. A substance used to stimulate the production of antibodies and provide immunity against a disease
12. A substance that stops or slows down the growth of microorganisms

1. The belief that the substances that make up the human body are: black bile, yellow bile, blood and phlegm
2. Heating liquid or food to kill microorganisms
3. A powerful Xray that provides a cross-section of the human body invented in 1972
5. An organism that can be seen only through a microscope.Examples include bacteria, protozoa, algae, and fungi
7. Medicines that treat infections by killing bacteria.
8. To give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease
9. Protected against, not affected by a disease