Respiratory System

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Across
  1. 2. The main organ of the respiratory system.
  2. 3. A tube that carries air from the throat to the lungs.
  3. 4. the tiny blood vessel that surround the alveolus to facilitate this exchange.
  4. 7. It protected the lungs
  5. 8. The process of breathing
  6. 9. Air enters the body through the nose.It directs air to the lungs and food to the stomach. The epiglottis (a small flap) closes when we swallow food to prevent choking.
Down
  1. 1. Tiny sacs where oxygen from the air enters the blood, and carbon dioxide is removed.
  2. 5. Clusters of alveoli that are grouped together at the ends of the alveolar ducts
  3. 6. two tubes that branch from the trachea into the lungs.
  4. 10. Located at the top of the trachea.