Across
- 2. romans built these to transport fresh water to highly populated areas
- 3. a powerful x-ray 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. a substance that stops or slows down the growth of microorganisms
- 8. the belief that substances that make up the human body are black bile yellow bile blood and phlegm
- 10. heating food to kill microorganisms
- 12. medicines that test infections by killing bacteria.
Down
- 1. a heart monitor invented by Willem Einthoven in the early 1900s
- 4. a substance used to stimulate the production of antibodies and provide immunity against a disease
- 6. to give a weak from of a disease to a person or animal, usually by injection, as protection against that disease
- 9. an unpleasant or unhealthy smell or vapour
- 11. protected against, not affected by a disease