respiratory system

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Across
  1. 3. – tiny air sacs where gas exchange (oxygen in, carbon dioxide out) happens.
  2. 4. – alternate entry for air.
  3. 6. – passage for air from the nose and mouth.
  4. 7. – two main branches of the trachea leading to each lung.
  5. 8. – main organs of respiration that contain bronchi, bronchioles, and alveoli.
Down
  1. 1. – muscle below the lungs that helps with inhaling and exhaling.
  2. 2. – smaller airways branching from the bronchi inside the lungs.
  3. 5. – tube that carries air to the lungs.
  4. 8. – contains the vocal cords and connects to the trachea.