Across
- 2. Major valve
- 3. Organ that secretes hormones
- 7. Blood cell
- 9. Helps clot blood
- 12. Carries blood away
- 13. Master gland in the brain
- 14. Insulating sheath on an axon
- 15. Heart valve
- 19. A cluster of nerve cells
- 21. Chemical messenger
- 23. Lower heart chamber
- 24. Oxygen carrier
- 25. Fluid of immunity
Down
- 1. Filter lymph
- 4. A bundle of axons
- 5. Heart divider
- 6. Lung valve
- 8. The tenth cranial nerve
- 10. Gland on top of the kidney
- 11. Gland in the neck
- 16. Heart valve
- 17. Controls blood flow
- 18. Produces blood cells
- 20. Involuntary response
- 22. Upper heart chamber