Across
- 3. ball of cells
- 4. embryo attaches to uterus
- 5. growth, metabolism
- 6. makes hormones
- 8. sperm joins egg
- 9. makes body respond
- 10. replaces lining of uterus
- 13. automatic
- 15. you choose to control
- 16. chemical made to function in a different area
Down
- 1. nerve cell in brain
- 2. sensory and motor nerves
- 7. brain and spine
- 11. fights infection
- 12. baby in the womb
- 14. blood sugar