Across
- 4. lower chamber that pumps blood out of the heart
- 6. a passage way for food and air
- 8. tiny air sacs in the lungs
- 9. vessels that carry blood from the heart
- 10. build up of fatty deposits on the inner walls of arteries
- 12. the smallest of the blood vessels
- 13. thick layer of muscle in the heart
- 14. group of cells in the right atrium that set the pace for the heart beat
- 15. also know as white blood cells
- 18. upper chamber in heart that receives blood
- 21. flaps of connective tissue that open and shut in the heart
- 23. stimulant drug that increases the heart rate and blood pressure
Down
- 1. iron containing protein that binds to oxygen in blood
- 2. flat muscle that raises and lower chest cavity in breathing
- 3. largest artery in the heart
- 5. straw colored fluid in blood
- 7. fluid that is lost by the blood
- 11. system that consists of the heart and blood vessels
- 16. fragments that aid in blood clotting
- 17. the windpipe
- 19. contains the vocal cords
- 20. two large passage ways in the chest cavity for air
- 22. vessels that carry blood to the heart