Respiratory System Crossword Puzzle

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Across
  1. 4. A small, branched airway in the lungs.
  2. 5. Respiratory structure that filters, warms, and moistens air and helps us smell.
  3. 7. The majority of carbon dioxide travels in the blood as this ion.
  4. 8. Muscle used for breathing.
  5. 9. Process whereby carbon dioxide is expelled from the lungs.
Down
  1. 1. Space at the back of the nose and mouth.
  2. 2. Also known as the windpipe.
  3. 3. Where cellular respiration takes place.
  4. 6. Thick strands of tissue across the larynx that vibrate to make sound (2 words).
  5. 10. This lung has only two lobes.