Cardio/Respiratory Crossword

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Across
  1. 6. the act of breathing in gas to fill the lungs
  2. 9. side of the heart that is oxygen-poor (blue)
  3. 11. the gas that is exhaled by mammals
  4. 13. blood vessels that connect veins and arteries
  5. 15. major organs of the respiratory system
  6. 16. a flap of cartilage at the top of the trachea that covers the opening of the windpipe
  7. 18. windpipe of the respiratory system
  8. 19. smaller branches of the major air passages that extend off of the trachea
Down
  1. 1. involved in swallowing, breathing, and voice production
  2. 2. blood vessels that carry blood away from the heart
  3. 3. the gas that is inhaled by mammals
  4. 4. the number of chambers in the heart
  5. 5. the act of breathing out gas to expel the lungs
  6. 6. during inhalation, the thoracic cavity _____ in size
  7. 7. many tiny air sacs of the lungs which allow for gas exchange
  8. 8. blood vessels that carry blood towards the heart from the lungs
  9. 10. during exhalation, the thoracic cavity _____ in size
  10. 12. major air passages of the lungs which branch off of the trachea
  11. 14. side of the heart that is oxygen-rich (red)
  12. 17. the number of ventricles or atriums in the heart
  13. 20. major organ of the cardiovascular system