Respiratory System

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Across
  1. 1. Coughing and sneezing keep your lungs ____
  2. 4. Breathing allows you to take in the oxygen your _____
  3. 6. You lose a lot of water just by __________
  4. 8. Your ____ is a filter, heater, and a humidifier
Down
  1. 2. Children who breathe directly from the mouth will likely develop a ___
  2. 3. Lungs are not ____ free
  3. 5. ____ is the only organ that can float on water
  4. 7. Some ___ never leaves your lungs