Respiratory System Crossword Puzzle

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Across
  1. 4. Lets air in and out of the lungs
  2. 9. Beginning of the respiratory system. Filters and makes air warm
  3. 10. Allows air to travel to epiglottis
  4. 11. Main part of respiratory system. Inhales oxygen and exhales carbon dioxide
Down
  1. 1. Folds to food and liquid from entering the larynx
  2. 2. Carries carbon dioxide out the lungs
  3. 3. Contracts to create an air vacuum and forces air into the lungs
  4. 5. Carries air into lungs and alveoli
  5. 6. Alternative way of breathing
  6. 7. Small sacs where lungs and blood exchange carbon dioxide and oxygen
  7. 8. Prevents food of going into airways