Across
- 6. _____ introduce microbes.
- 7. In order for the ____ to work it must know which cells are good and bad
- 9. ______ trigger an immune response in the body.
- 10. the immune system helps protect us against ________.
Down
- 1. our body's gain _____ in two ways active immunity and passive immunity.
- 2. what is it called when our bodies develop immunitie over time
- 3. The immune system is able to ______ through the entire body.
- 4. ____ introduce microbes that are already killed or modified.
- 5. The immune system is made up of _____.
- 8. what type of cells are found in the blood stream.