Across
- 2. a dead or inactive pathogen
- 3. even smaller than bacteria
- 5. is the first line of defense against infection
- 7. organism that causes a disease
- 9. damages your cells and tissues
- 10. receive all of this to prevent catching an illness
- 12. protein on the surface of a pathogen
Down
- 1. when there is a pathogen in the body
- 4. one-celled organism that can only be seen through a microscope
- 6. any living thing
- 8. when a white blood cell detects an antigen that is foreign to the body, it signals the immune system to produce this
- 11. this system defends your body against disease