Across
- 2. Flap of tissue that prevents backflow of blood.
- 6. Upper chamber of the heart that receives returning blood.
- 8. Vessels that bring oxygenated blood from the lungs to the heart.
- 11. Specialized conduction bundle connecting the atria and ventricles.
- 13. Specialized fibers conducting impulses through the ventricles.
- 14. Red blood cell that carries oxygen.
- 15. Cell fragment that helps blood to clot.
- 17. Vessel that carries blood away from the heart.
- 19. Phase when the heart relaxes and fills with blood.
- 20. Natural pacemaker of the heart located in the right atrium.
Down
- 1. White blood cell that engulfs and digests pathogens.
- 3. Small artery leading to capillaries.
- 4. Vessel that carries blood back to the heart.
- 5. Smallest blood vessel where gas exchange occurs.
- 7. Lower chamber that pumps blood out of the heart.
- 9. Muscle tissue that contracts to pump blood from the heart.
- 10. Type of white blood cell important in fighting infections.
- 12. Phase when the heart contracts to pump blood.
- 16. Process where blood is pushed out of the ventricles.
- 18. Period during which the heart Chambers fill with blood.