Across
- 2. This system fights off viruses and bacteria.
- 3. Important for a healthy gut.
- 5. Largest organ in the human body.
- 7. Your stomach has these to tell the brain it is full.
- 9. Takes blood away from your heart.
- 11. Healthy lungs are this color.
- 13. When you ______ your lungs release carbon dioxide.
- 14. Carries blood to your heart.
Down
- 1. This organ beats about 100,000 times a day.
- 4. The adult human body has 206 of these.
- 6. Largest bone in the human body.
- 8. The body's computer.
- 10. When you ______ your lungs oxygenate your blood.
- 12. Your body is made up of these.