The Heart

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Across
  1. 3. The natural pacemaker of the heart, initiating electrical impulses that trigger heartbeats.
  2. 4. Specialized conductive fibers that spread the electrical impulse throughout the ventricular walls, causing contraction.
  3. 5. The thick, muscular layer of the heart responsible for pumping blood.
  4. 8. sinus A collection of veins that drains deoxygenated blood from the heart muscle into the right atrium.
  5. 11. The largest artery in the body, carrying oxygenated blood from the left ventricle to the rest of the body.
  6. 12. The inner lining of the heart chambers and valves, providing a smooth surface for blood flow.
  7. 16. The double-walled sac that encloses the heart, providing protection and reducing friction.
  8. 18. The chamber of the heart responsible for pumping oxygenated blood to the entire body through the aorta.
  9. 19. HIS A pathway of cardiac tissue that transmits electrical impulses to the ventricles, ensuring coordinated contraction.
  10. 20. The chamber of the heart that receives deoxygenated blood from the body through the vena cavae.
  11. 21. cava The large veins (superior and inferior) that carry deoxygenated blood from the body back to the heart.
  12. 22. Also known as the Bundle of His, it conducts signals from the AV node to the ventricles.
  13. 23. The valve between the left atrium and left ventricle, preventing backflow of blood into the atrium.
Down
  1. 1. The chamber of the heart that receives oxygenated blood from the lungs via the pulmonary veins.
  2. 2. A cluster of cells in the heart that transmits signals from the SA node to the ventricles.
  3. 6. arrest A sudden loss of heart function, resulting in the cessation of blood circulation.
  4. 7. The valve located at the exit of the left ventricle, controlling blood flow into the aorta.
  5. 9. The valve between the right atrium and right ventricle that prevents backflow of blood.
  6. 10. The valve located at the exit of the right ventricle, controlling blood flow into the pulmonary artery.
  7. 13. An artificial device used to regulate the heartbeat in individuals with irregular heart rhythms.
  8. 14. The wall dividing the left and right sides of the heart, preventing the mixing of oxygenated and deoxygenated blood.
  9. 15. The blood vessel carrying deoxygenated blood from the right ventricle to the lungs for oxygenation.
  10. 17. The chamber of the heart responsible for pumping deoxygenated blood to the lungs via the pulmonary artery.