Across
- 4. valve positioned between the right ventricle and the pulmonary artery (two words)
- 6. flow of blood from the heart to the lungs and back to the heart (two words)
- 7. one of two pairs of vessels carrying oxygenated blood from the lungs to the left atrium of the heart (two words)
- 9. thin-walled vessel that carries blood from body tissues and lungs back to the heart.
- 10. muscular middle layer of the heart
- 12. innermost lining of blood vessels
- 13. largest type of blood vessel
- 14. one of two upper chambers of the heart
- 15. valve between the left atrium and the left ventricle (two words)
- 17. inner lining of the heart
- 18. largest artery in the body
- 19. one of two lower chambers of the heart
- 20. specialized nervous tissue in the right atrium that begins the heartbeat
Down
- 1. located between the right atrium and the right ventricle (two words)
- 2. double-layered membrane surrounding the heart
- 3. smallest type of blood vessel
- 5. largest vein in the body (two words)
- 6. artery carrying oxygen-poor blood from the heart to the lungs (two words)
- 8. small vein
- 11. small artery
- 16. structure in begins or in the heart that temporarily closes an opening so that blood flows in only one direction
- 20. beat of the heart as felt through the walls of the arteries