HEART CROSSWORD

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Across
  1. 4. heart beat is this; has an intrinsic (self) initiation of heart beat
  2. 6. increase heartbeat if they detect a lack of oxygen or an increase in carbon dioxide
  3. 7. membranous sac protecting heart and anchoring it in place
  4. 8. the other name for the mitral valve
  5. 10. surge of blood through an artery
  6. 15. receives blood oxygenated blood from the lungs
  7. 16. slows heart when pressure gets too high
  8. 17. when blood is pressurized the rate of diffusion___
  9. 18. carries blood from walls of the heart muscle
  10. 20. key organ of the circulatory system
  11. 22. thick-walled lower chambers of the heart
  12. 24. the brain does not command the heart to beat; it’s an action___ action
  13. 26. average, normal blood pressure is 120 over ___
  14. 27. upper chamber of the heart where blood returns from the body
  15. 28. vessels that carry blood away from the heart
Down
  1. 1. the fluid between the layers of the pericardial sac act as a ___ to reduce friction
  2. 2. vena cava which carries blood from the lower torso and limbs
  3. 3. the SA node
  4. 5. what are the brain that regulates heartbeat
  5. 9. period of relaxation
  6. 11. tiny blood vessels; sites of exchange
  7. 12. artery that carries deoxygenated blood to the lungs
  8. 13. blood vessels that return blood to the heart
  9. 14. systolic over diastolic
  10. 15. location of the heart within the chest cavity
  11. 19. structure of the heart muscle
  12. 21. allow fluid movement in only one direction
  13. 23. vena cava which carries blood from the upper torso and limbs
  14. 25. systole is the period of ___