Across
- 2. Two-cusped valve between the left atrium and left ventricle
- 3. Largest artery in the body
- 6. Smooth inner lining of the heart chambers
- 8. Double-walled sac that surrounds the heart
- 9. Swelling caused by excess fluid in tissues
- 12. Tiny vessel where gas and nutrient exchange occurs
- 16. Narrowing of blood vessels that reduces blood flow
- 18. Valve that controls blood flow from the right ventricle to the lungs
Down
- 1. Small branch of an artery leading to capillaries
- 4. Three-flapped valve between the right atrium and right ventricle
- 5. Widening of blood vessels that increases blood flow
- 7. Blood vessel that returns blood to the heart
- 10. Localized collection of blood outside blood vessels
- 11. Muscular middle layer responsible for heart contractions
- 13. Valve that prevents backflow from the aorta into the left ventricle
- 14. Outermost layer of the heart wall
- 15. Small blood vessel that drains blood from capillaries
- 17. Wall that separates the right and left sides of the heart
- 19. Blood vessel that carries blood away from the heart