Across
- 2. flap
- 6. two upper chambers in the heart
- 7. the act of breathing
- 8. tube that relates to the blood circulation system
- 9. sound and voice
- 11. two upper chambers in the heart
- 13. any of the branching vessels that network
- 14. where gas exchange takes place
- 16. a colorless fluid containing white blood cells
Down
- 1. inside your body
- 3. used to stimulate the heart muscles
- 4. a large membranous tube reinforced by rings of cartilage
- 5. consisting of the heart and blood vessels
- 10. forms during the clotting of blood
- 12. the throat
- 15. the colorless part of blood