Across
- 5. Pathogens that can cause disease, but must be already living inside a cell to reproduce.
- 6. A disease that can be spread from person to person.
- 7. First line of defence that stops germs from entering the body.
- 8. Anything that interferes with the normal functions of the body.
- 9. Where white blood cells are produced.
Down
- 1. System that helps the body fight disease to keep it healthy.
- 2. Cells that thicken the blood after a cut to help prevent blood loss
- 3. Cells that find and kill germs before they cause illness
- 4. Single celled organisms that cause disease and can live on many surfaces.