Across
- 3. Innermost lining of blood vessels
- 6. Gas that enters the body through the lungs and travels to the heart
- 7. Small vein
- 8. Contraction phase of the heartbeat
- 10. Thin-walled vessel that carries blood from body tissues and lungs back to the heart
- 11. small artery
- 13. two upper chambers of the heart
- 14. Muscular middle layer of the heart
Down
- 1. valve Valve between the left atrium and left ventricle;bicuspid valve
- 2. Beat of the heart as felt through the walls of the arteries
- 4. Relaxation phase of the heartbeat
- 5. Inner lining of the heart
- 9. largest artery in the body
- 10. One of two lower chambers of the heart
- 12. smallest type of blood vessel