The Respiratory System

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Across
  1. 1. It is the pipe that sends air into the lungs.
  2. 4. It is found at the end of the trachea and splits the air into each lung.
  3. 5. This is the muscle that is responsible for inflating and deflating the lungs.
Down
  1. 2. These are the air sacs that exchange oxygen and carbon dioxide in the blood.
  2. 3. It is the organ that collects air.
  3. 4. These are the small air tubes that connect to the alveoli.