Respiratory system

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Across
  1. 1. Tube that carries air from the larynx to the bronchi
  2. 3. Process where the diaphragm relaxes and air leaves the lungs
  3. 5. Movement of gas particles from high to low concentration
  4. 8. Site of gas exchange, have very thin walls
  5. 9. muscles Muscles between ribs that help expand and contract the chest
  6. 10. Flap that prevents food from entering the airway
Down
  1. 2. Tiny blood vessels surrounding alveoli
  2. 4. Triggered by too much CO2 in our blood
  3. 5. Contracts during inhalation, causes lungs to inflate
  4. 6. Smaller air passages that lead to the alveoli
  5. 7. Bones that protect our internal organs