Respiratory system anatomy

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Across
  1. 2. throat; tube that is 5 inches long
  2. 6. the name of the smooth tissue that surrounds the lungs
  3. 8. small hairs that heat and filter air
  4. 9. a substance inside the nasal cavity that is a line of defense against bacteria and foreign debris
  5. 10. grape like sacs; gas exchange happens here
  6. 12. the right lung has three of these
Down
  1. 1. smallest conducting passages leading to the alveoli
  2. 3. flap that stops food or other substances from entering the lungs; reflex
  3. 4. the last tube right before the air enters the lungs that is made of cartilaginous rings
  4. 5. primary, secondary, and tertiary branches of the tree
  5. 7. where the air enters the nose; visible part of the respiratory system
  6. 11. guides air to the trachea