Respiratory and Cardiovascular Systems

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Across
  1. 4. lower chambers of the heart
  2. 5. deep rapid breathing that lowers carbon dioxide levels in the blood
  3. 6. blood in the chest
  4. 7. upper chambers of the heart
  5. 10. primary pacemaker
  6. 11. only artery carrying deoxygenated blood
  7. 14. wall dividing heart into right and left sides
  8. 17. air in the chest
  9. 18. cardiac cell ability to generate impulse to contract even with no external nerve stimulus
  10. 20. lining of the thorax
  11. 23. vocal cords and opening between them
  12. 24. lining covering the lungs
  13. 25. heart muscle
Down
  1. 1. only vein carrying oxygenated blood
  2. 2. tertiary pacemaker
  3. 3. windpipe
  4. 8. air sacs at end of bronchioles where gas exchange takes place
  5. 9. having to do with the lungs
  6. 12. secondary pacemaker
  7. 13. lowest point of cartilage in trachea
  8. 15. death of heart muscle
  9. 16. deficiency of oxygen reaching the tissues
  10. 19. entry point for bronchi vessels nerves to enter the lungs
  11. 21. action of breathing
  12. 22. movement of air in and out of the bronchial tree and alveoli