Respiratory System Review

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Across
  1. 1. Main organs of the respiratory system (5 letters)
  2. 2. The throat; passageway for air and food (7 letters)
  3. 4. Tubes that branch from the trachea into the lungs (7 letters)
  4. 7. Tiny blood vessels that exchange gases in the alveoli (10 letters)
  5. 9. Gas that is essential for cellular respiration (6 letters)
  6. 10. Tube that connects the throat to the lungs (7 letters)
  7. 11. Cavity Space inside the nose that filters, warms, and moistens air (11 letters)
  8. 14. Muscles between the ribs that assist in breathing (10 letters)
  9. 15. Abbreviation for the gas exhaled from the lungs (2 letters, 1 number)
Down
  1. 1. Voice box located at the top of the trachea (6 letters)
  2. 3. Muscle that aids in breathing by contracting and relaxing (9 letters)
  3. 5. The process of inhaling oxygen and exhaling carbon dioxide (11 letters)
  4. 6. Membrane surrounding the lungs (6 letters)
  5. 8. Microscopic air sacs where gas exchange occurs (7 letters)
  6. 12. Flap of tissue that prevents food from entering the trachea (9 letters)
  7. 13. Small branches of the bronchi inside the lungs (10 letters)