THE RESPIRATORY SYSTEM

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