Respiratory System

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Across
  1. 4. The muscle that helps us inhale and exhale.
  2. 6. Brings deoxygenated blood to the lungs from the heart.
  3. 8. The outer covering of the lungs.
  4. 9. The singular form of bronchus. The trachea divides into this.
  5. 10. The vocal box of the body.
  6. 11. We breath in this gas.
  7. 12. A passage that leads from the mouth to the lungs.
Down
  1. 1. Also called air-sacs.
  2. 2. The passage where air is warmed, humidified and purified.
  3. 3. We breath out this gas.
  4. 5. Samllest of the respiratory branches.
  5. 6. Brings oxygenated blood to the heart from the lungs.
  6. 7. Breathing out.