Across
- 3. specialized muscle fibers connecting the atria with the ventricles and transmitting electrical impulses between them
- 5. double-layered membrane surrounding the heart
- 6. inner lining of the heart
- 8. blood that is oxygen-poor
- 9. relation phase of the heartbeat
- 11. contraction phase of the heartbeat
- 12. located between the right atrium and the right ventricle
- 14. one of two pairs of vessels carrying oxygenated blood from the lungs to the left atrium of the heart
- 16. partition or wall dividing a cavity between the right and left aorta
Down
- 1. smallest type of blood vessel
- 2. blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle
- 4. pacemaker of the heart
- 7. muscular middle layer of the heart
- 10. artery carrying oxygen-poor blood from the heart to the lungs
- 13. small artery
- 14. beat of the heart as felt through the walls of the arteries
- 15. abnormal swishing sound caused by improper closure of the heart valves