Respiratory System

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Across
  1. 3. A muscle at the bottom of the chest that helps you breathe by moving air in and out of the lungs.
  2. 6. The tube that carries air from the throat to the lungs; also called the windpipe.
  3. 8. The voice box above the trachea that produces sound and protects the airway when swallowing.
  4. 9. The organs that help you breathe by taking in oxygen and getting rid of carbon dioxide.
Down
  1. 1. The openings of the nose that let air in.
  2. 2. Small branches of the bronchi that lead to the alveoli and help regulate airflow.
  3. 4. The tube that connects the nose and mouth to the larynx and esophagus, allowing air and food to pass through.
  4. 5. The two main tubes that branch from the trachea into each lung.
  5. 7. Tiny air sacs in the lungs where oxygen enters the blood and carbon dioxide is removed.