The Respiratory System

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Across
  1. 3. Smaller branching tubes that lead to alveoli.
  2. 5. Opening to the trachea located between the vocal cords.
  3. 6. Cavity where pressure changes drive breathing.
  4. 8. Windpipe supported by C-shaped cartilage rings.
  5. 9. Most abundant gas in Earth’s atmosphere.
  6. 14. Tissue that prevents the trachea from collapsing by forming C-shaped rings.
  7. 15. Tiny blood vessels surrounding alveoli for gas exchange.
  8. 17. Main airway branch leading into each lung.
Down
  1. 1. Process where gases move from high to low concentration (or from high to low pressure).
  2. 2. Grape-shaped sacs where gas exchange occurs.
  3. 4. Process in which cells use O₂ to produce ATP and release CO₂ as a waste product.
  4. 7. Protein in red blood cells that binds and carries oxygen.
  5. 10. Muscles between the ribs that help expand the chest cavity.
  6. 11. Gas inhaled and delivered to cells for energy production.
  7. 12. Muscle that contracts and moves downward during inhalation.
  8. 13. Air passes through this after the nose and before the trachea.
  9. 16. Voice box that houses the vocal cords.