Respiratory System Crossword

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Across
  1. 1. A verb used to describe how muscles tighten and shorten
  2. 8. Small extensions of the bronchi that end in alveoli
  3. 10. A process where cells use oxygen to transfer energy
  4. 11. A verb used to describe how we use the respiratory system to take in air
  5. 13. A change in state where gas molecules turn into liquid molecules
  6. 14. A specialised cell found in the lungs that allows gas exchange to take place
Down
  1. 2. A gas that is moved across alveoli and into the bloodstream during gas exchange
  2. 3. A long tube made of cartilage and cells that leads to the bronchi
  3. 4. A gas that moves out of the bloodstream and into alveoli during gas exchange
  4. 5. A verb used to describe how we use the respiratory system to remove air
  5. 6. A pair of tubes that leads towards the lungs
  6. 7. A structure made of bones that helps to protect the lungs
  7. 9. A sheet of muscle in the respiratory system that can change the volume of the chest
  8. 12. A pair of organs made of specialised cells that can inflate