Respiratory and Cardiovascular Systems

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