Key words

3. A powerful Xray that provides a cross-section of the human body invented in 1972
5. The Romans built these to transport fresh water to highly populated areas
7. The belief that the substances that make up the human body are: black bile, yellow bile, blood, and phlegm.
9. Heart monitor invented by Willem Einthoven in the early 1900’s
10. Medicines that treat infections by killing bacteria
11. An organism that can be seen only through a microscope. Example, bacteria
12. A substance used to stimulate the production of antibodies and provide immunity against a disease

1. An unpleasant or unhealthy smell or vapour.
2. protected against, not affected by a disease
4. substance that stops the growth of microorganisms
6. Heating liquid or food to kill microorganisms
8. To give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease