Key words

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