Cardiovascular system

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Across
  1. 4. react to abnormal levels of oxygen
  2. 5. sends electrical pulses to set the rate for heart contractions
  3. 13. septum between the ventricle
  4. 15. lines heart chambers and makes up the tissue of heart valves
  5. 19. slow pulse and heart rate
  6. 20. inner membrane of the heart
  7. 21. two saclike membranes that enclose the heart
  8. 22. how blood pressure is often measured
  9. 25. rapid pulse and heart beat
  10. 27. two receiving chambers
  11. 28. condition that develops when the cardiovascular system fails to deliver enough oxygen and nutrients to the cells
  12. 30. pumping chambers inferior to the atria
Down
  1. 1. heart contractions
  2. 2. located on left side of the heart; only has 2 flaps and a mitral valve
  3. 3. returns blood from the head to neck
  4. 6. detects impulse transmission through the heart's conduction system
  5. 7. when the heart contracts rapidly/irregularly
  6. 8. clusters of neurons located in the major arteries of the heart and chest
  7. 9. outer membrane of the heart
  8. 10. enter organs and tissues then branch into capillaries
  9. 11. mass of tissue that longitudinally separates heart chambers
  10. 12. part of brain that helps regulate blood flow
  11. 14. extends from the heart to the lungs and back to the heart
  12. 16. largest artery in the body
  13. 17. located between the right atrium and ventricle; has 3 valves or cusps
  14. 18. relaxation period of the heart
  15. 23. circular muscles that open and close to regulate blood flow through capillaries
  16. 24. when pressure accumulates and the vein is dilated
  17. 26. irregular heart beat rhythms
  18. 29. merge with other venules to form a vein