Across
- 6. immune systems effects
- 9. the dosage causing death in 50% of exposed animals
- 10. one chemical that is not toxic causes another chemical to become more toxic
- 12. toxic substance that is man-made
- 14. exposure for 1 to 3 months
- 15. exposure for 1 month or less
- 17. combination of two or more chemicals is greater than the sum of the individual effects
- 18. combination of two chemicals produces an effect equal to their individual effects
- 19. exposure for than 3 months
- 20. period between initial exposure and a measurable response
Down
- 1. study of how often diseases occur in different groups of people and why
- 2. chemicals are registered for us in the US
- 3. chemical substances that are foreign to the biological system
- 4. easiest way of entry into the body
- 5. is the study of the effects of the toxic chemicals on biological organisms
- 7. chemical (or substance) that causes or is suspected of causing cancer
- 8. two chemicals administered together interfere with each other
- 11. an agent or factor that causes malformation of an embryo
- 13. toxic substance made by a living organism
- 16. usually a single exposure for less than 24 hours