THE RESPIRATORY SYSTEM

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Across
  1. 5. the main tube that carries air to and from the lungs.
  2. 6. a muscle on the underside of the lungs; when it contracts and relaxes, it allows air to be inhaled and exhaled from the lungs.
  3. 8. the part of the throat that contains the voice box or vocal cords.
  4. 10. used.
  5. 12. the release of energy in cells by the combination of food and oxygen.
  6. 13. kind of blood vessel.
  7. 14. (Bronchus) the main branches (small tubes) of the respiratory tract leading into the lungs.
  8. 15. a sticky substance produced by the nose to moisten the inhaled air and trap dust and bacteria.
  9. 17. dioxide a gaseous waste product of respiration which is exhaled from animals.
  10. 19. small sacs at the end of each tiny branch of the bronchi. This is where oxygen reaches the bloodstream.
Down
  1. 1. the body organ that allows air to enter our body when the nostrils are not
  2. 2. also known as the windpipe, this tube is the passage for air from the larynx to the bronchial tubes.
  3. 3. tiny blood vessels connecting the small arteries and veins. It is the
  4. 4. the gas in the atmosphere that is used by our cells.
  5. 7. You have two lungs. They fill with air when you inhale. This is the main organ of the respiratory system.
  6. 9. the bones that protect our lungs.
  7. 11. These small branches lead to the air sacs.
  8. 16. Tiny hairlike structures that sweep mucus from the nose into the throat are called.
  9. 18. the body organ that contains the nostrils.