Respiratory System

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Across
  1. 3. The two tubes that branch off from the trachea and enter the lungs.
  2. 4. The trachea splits into how many tubes before entering the lungs.
  3. 6. called the voicebox
  4. 7. When the diaphragm contracts the lungs
  5. 11. Movement of air into and out of the lungs
  6. 12. Microscopic sacs at the end of each bronchiole; site of gas exchange
  7. 13. The main organ of the respiratory system
Down
  1. 1. When the diaphragm relaxes the lungs
  2. 2. a tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth or nose.
  3. 3. Once the oxygen is used, it binds with ______ and then returned to the lungs it can be expelled.
  4. 4. The windpipe tube that connects the pharynx to the lungs
  5. 5. moves into the lungs, which is picked up by blood cells and taken to every part of the body.
  6. 8. large muscles below the lungs which makes up the floor of the thoracic cavity, which is the cavity that holds the lungs.
  7. 9. Breathe out
  8. 10. Breathe in