Respiratory System

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Across
  1. 3. muscle located under the lung which aids in the breathing process
  2. 4. filters the air we inhale and branches into the bronchi
  3. 5. tubes which lead from the trachea to each lung
  4. 7. tiny sacs within the lungs where gaseous exchange occurs
  5. 11. the process by which a substance moves from a area of high concentration to an area of low concentration
  6. 12. main organ of the respiratory system
  7. 13. located at the back of the nose and mouth which carries both food and air
  8. 14. tiny hair like projections which move in a wavelike motion to remove dust and dirt
Down
  1. 1. the process of letting air out of the lungs
  2. 2. bone structure which protects the heart and lungs
  3. 6. an organ with two openings that have hairs to filter the air that enters the body
  4. 8. also known as the voice box
  5. 9. the process of taking air into the lungs
  6. 10. a substance that warms and moistens the air as well as trapping foreign substances