Body System Review - Respiratory

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Across
  1. 3. Voice Box
  2. 5. Back of the Throat
  3. 6. Large flat muscle at the bottom of the chest cavity that contracts during breathing
  4. 7. Two main branches off the trachea
  5. 8. allows exchange of the oxygen and carbon dioxide between the blood and the enviroment
Down
  1. 1. Windpipe that is held open by rings of cartilage
  2. 2. Smaller Branches off the bronchi
  3. 4. Warms, moistens and filter the air
  4. 9. Air Sacs that are one celled thick and covered with capillaries so that oxygen and carbon dioxide can be exchanged