Across
- 4. - Specialized fibers that help distribute electrical impulses to the ventricles.
- 6. - A blood vessel that returns deoxygenated blood to the heart.
- 8. - One of the two lower chambers of the heart that pumps blood out.
- 9. - The valve between the left atrium and left ventricle.
- 11. - The largest artery in the body, carrying oxygenated blood from the heart.
- 12. - The node that slows electrical impulses before they reach the ventricles.
- 14. - The thin inner lining of the heart chambers.
- 16. - A blood vessel that carries oxygen-rich blood away from the heart.
- 17. - The node in the heart known as the natural pacemaker.
- 18. - The smallest blood vessels where oxygen exchange occurs.
Down
- 1. - The valve between the right atrium and right ventricle.
- 2. - The valve that controls blood flow from the left ventricle to the aorta.
- 3. - The muscular wall that separates the left and right sides of the heart.
- 5. - The two upper chambers of the heart that receive blood.
- 6. - A structure that prevents the backflow of blood in the heart.
- 7. - The protective sac surrounding the heart.
- 10. - The thick, muscular middle layer of the heart wall.
- 13. - The valve that controls blood flow from the right ventricle to the lungs.
- 15. - Refers to the arteries that supply blood to the heart muscle.