Across
- 2. to give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease
- 4. a substance that stops or slows down the growth of microorganisms
- 7. Heating liquid or food to kill microorganisms
- 11. An organism that can be seen only through a microscope. Examples include bacteria, protozoa, algae, and fungi.
- 12. A powerful Xray that provides a cross-section of the human body invented in 1972
Down
- 1. a heart monitor invented by Willem Einthoven in the early 1900’s
- 3. Medicines that treat infections by killing bacteria.
- 5. The Romans built these to transport fresh water to highly populated areas.
- 6. The belief that the substances that make up the human body are: black bile, yellow bile, blood, and phlegm.
- 8. A substance used to stimulate the production of antibodies and provide immunity against a disease
- 9. protected against, not affected by a disease
- 10. An unpleasant or unhealthy smell or vapour.