Across
- 4. lower tip of heart
- 5. located on each side of neck
- 7. smallest vein
- 8. gas enters through lungs
- 9. largest vein
- 12. vessel that carries blood
- 13. upper chamber of heart
- 14. inner lining of heart
Down
- 1. lower chamber of heart
- 2. small blood vessel
- 3. gas released by cells
- 6. membrane surrounding the heart
- 10. contraction of heartbeat
- 11. incomplete closer of heart valves
- 13. largest artery in the body