Cardiovascular System Crossword

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Across
  1. 2. Doors in the heart that open and shut controlling blood flow.
  2. 5. Two lower chambers of the heart.
  3. 7. A wall separating the left and right sides of the heart.
  4. 10. Generates an electrical signal that causes the upper heart chambers to contract.
  5. 12. Decrease in the diameter of a blood vessel.
  6. 17. A blood vessel that carries blood to the heart.
  7. 18. Fluid like membrane that surrounds the heart.
  8. 21. The outermost protective layer of the heart.
  9. 23. Increase in the diameter of a blood vessel.
  10. 26. Phase of the heartbeat where the muscles relax filling the chambers up with blood.
  11. 27. A drug free method to quickly return an abnormal heart rhythm to normal.
Down
  1. 1. Branches of specialized nerve cells that send electrical signals to the ventricles.
  2. 3. Conducts the normal electrical impulse from the atria to the ventricles.
  3. 4. The middle muscular layer of the heart.
  4. 6. Small blood vessels that carry blood away from the heart.
  5. 8. The innermost layer of tissue that lines the chambers of the heart.
  6. 9. The smallest veins that receive blood from capillaries.
  7. 11. The largest artery in the body, transports blood from the left ventricle..
  8. 13. Two upper chambers of the heart.
  9. 14. A test to record the electrical signals in the heart.
  10. 15. A measure of a fluid's resistance to flow.
  11. 16. The amount of blood ejected from the ventricle with each cardiac cycle.
  12. 18. Relating to the lungs.
  13. 19. Irregular heartbeat.
  14. 20. Phase of the heartbeat when the heart muscles contract pumping blood out.
  15. 22. Vessel that transports blood from the heart.
  16. 24. The slower the heart rate, the greater the cardiac output/more blood pumped.
  17. 25. One of the two large veins that carries deoxygenated blood to the heart.