Across
- 3. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells
- 4. Waste-filled blood then flows back to the heart in small venules, which combine to form larger vessels.
- 7. Innermost lining of blood vessels.
- 11. abnormal heart rhythms
- 12. Double-layered membrane surrounding the heart.
- 14. One of two upper chambers of the heart.
- 15. Inner lining of the heart.
Down
- 1. large blood vessels that carry blood away from the heart
- 2. Beat of the heart is felt through the walls of the arteries.
- 5. Largest artery in the body.
- 6. (widened blood vessel)
- 8. Muscular middle layer of the heart.
- 9. Smallest type of blood vessel.
- 10. Contraction phase of the heartbeat.
- 13. Abnormal swishing sound caused by improper closure of the heart valves