THE RESPIRATORY SYSTEM

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