Across
- 3. the body's transport system called
- 6. thicker side of heart
- 8. carries blood back into the heart
- 9. blood is carried around the body by the system called
- 12. carry blood from the body's cells
- 13. lower chamber is called
- 15. remove urea from the blood
Down
- 1. each section of the heart is called
- 2. upper chamber is called
- 4. extensive network of capillaries
- 5. converts excess protein into urea
- 7. the system that removing waste from the body
- 10. allow water and salt to move out of the body
- 11. carries blood away from the heart
- 14. remove carbon dioxide