Across
- 2. Contraction of the heart to pump blood out
- 4. Smallest form of a vein and furthest from the heart
- 5. generates an electrical signal to cause the atria to contract
- 6. The two upper chambers of the heart
- 7. Node controlling heart rate
- 9. Border separating the left and right chambers
- 11. Blood vessel carrying blood away from the heart
- 12. Very Large vein carrying blood to the heart
- 16. Irregular or very fast heart rhythm
- 17. doorway to let blood into heart chambers
- 19. outermost protective layer of the heart
- 20. dilation of a blood vessel
Down
- 1. Blood vessel carrying blood back to the heart
- 3. Relating to the lungs
- 4. constriction of a blood vessel
- 8. Thin Fluid filled sac surrounding the heart
- 10. Middle muscular layer of the heart
- 13. a test using electrical signals to track heartbeat
- 14. The main artery of the body
- 15. Relaxation of the heart following systole
- 18. referring to how thick a liquid is
- 19. Inner most layer lining the chambers of the heart