Across
- 3. They vibrate when you're cold
- 6. The liver is a part of the _________ system
- 7. Where the nervous system passes through the back
- 9. _______ is an important nutrient for bodybuilding
- 10. The centre of the nervous system
- 12. Part of the respiratory system
- 13. The human leather
Down
- 1. Heartbeat from your wrist or neck
- 2. The passage for air to reach your lungs
- 4. We inhale oxygen and exhale carbon _______
- 5. _______ feedback keeps homeostasis
- 8. When you're cold, your blood protects your _______
- 10. The skeletal system is made up of _____
- 11. This liquid needs to be kept at a very certain pH in the human body