Respiratory System

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Across
  1. 2. – Muscle under lungs that contracts to help breathe in and out.
  2. 4. – Smaller tubes inside the lungs carrying air to alveoli.
  3. 6. – Tiny air sacs where oxygen enters the blood and carbon dioxide leaves.
  4. 9. – Passage connecting nose/mouth to the larynx.
  5. 11. – Sticky substance that traps dust, germs, and particles.
  6. 12. – Entry for air; filters, warms, and moistens it.
Down
  1. 1. – Tube carrying air from the larynx to the bronchi; lined with cilia.
  2. 3. – Tiny hairs in trachea/bronchi that sweep out dust and germs.
  3. 4. – Two main branches leading air into each lung.
  4. 5. – Directs air into the trachea and contains vocal cords.
  5. 7. – Organs holding bronchi, bronchioles, and alveoli; expand to move air.
  6. 8. – Flap that stops food entering the trachea when swallowing.
  7. 10. – Secondary entry for air, especially when breathing hard.