THE RESPIRATORY SYSTEM

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