Medicine

4. a heart monitor invented by William Einthoven in the early 1900'
6. A powerful X-ray that provides a cross-section of the human body invented in 1972
8. organism that can be only seen through a microscope
10. an unpleasant or unhealthy smell or vapour
11. heating liquid or food to kill microorganisms

1. medicines that treat infections by killing bacteria
2. to give a weak form of a disease to a person or animal, usually by injection, as a protection against the disease
3. the belief that the substances that make up the human body are: black bile, yellow bile, blood and phlegm
5. a substance used to stimulate the production of antibodies and provide immunity against disease
7. protected against not affected by a disease
9. a substance that stops or slows down the growth of microorganisms
12. the Romans built these to transport fresh water to highly populated areas