Across
- 1. a structure inside the heart at the exit of each chamber that prevents backflow of blood when the heart contracts
- 5. the valve found at the connection between the right atrium and right ventricle
- 9. a group of cells found in the lower wall of the right atrium near the coronary sinus that delays the conduction of the electrical impulse from the atria to the ventricles. This prevents the atria and ventricles from contracting at the same time.
- 11. one of the two arteries that carries blood to the heart itself
- 13. fibers that carry cardiac impulse from the left and right bundle branches to the heart muscle cells in the ventricles
- 15. the connection between the AV node in the right atrium and the ventricles; also called the Bundle of His
- 19. a valve found at the exit of the right atrium and the entrance to the pulmonary trunk
- 20. – the only veins in the body that contain oxygenated blood
- 22. group of cells in the right atrium that establishes the heart rate and initiates the impulse causing heart contraction
- 23. small, dome-shaped muscles on the inside wall of the heart that the chordae tendinae are attached to
- 24. a blood vessel that carries blood away from the heart to some part of the body
- 25. strong fibrous cords that attach the valves to the papillary muscles
- 27. system of blood vessels carrying blood from the heart to all parts of the body (except the lungs) and back again
- 28. the valve between the right ventricle and the pulmonary artery and has three cusp
Down
- 2. found at the exit of the left ventricle and prevents backflow of blood from aorta back into the left ventricle
- 3. a wide channel that receives blood from the coronary veins and empties into the right atrium of the heart
- 4. the system of blood vessels carrying the blood from the heart to the lungs and back again
- 6. a large vein the empties blood into the bottom of the right atrium; it brings blood back to the heart from the lower parts of the body
- 7. one of the upper chambers of the heart that receives blood from some part of the body
- 8. an artery that supplies the head (brain) and neck with oxygenated blood
- 10. an air-sac in the lung, made of simple squamous epithelium and surrounded by capillaries that absorb oxygen by diffusion
- 12. large vein that empties blood into the top of the right atrium; brings blood back to the heart from the upper parts of the body
- 14. one of the lower chambers of the heart that pumps blood to the body.
- 16. the valve between the left atrium and left ventricle that prevents backflow of blood into the left atrium when the ventricle contracts
- 17. carry deoxygenated blood from the right ventricle of the heart to the lungs
- 18. the large blood vessel that receives de-oxygenated blood from the right ventricle
- 21. blood vessel that returns blood to the heart from somewhere in the body
- 26. a connection of two blood vessels that previously branched out; also called fistulas