Respiratory System

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Across
  1. 2. - The two main branches that the trachea divides into.
  2. 3. - The substance that transports oxygen throughout the body.
  3. 5. - The muscle that helps with breathing by expanding and contracting the lungs.
  4. 7. Dioxide - The waste gas removed from the body during exhalation.
  5. 9. - Tiny air sacs in the lungs where gas exchange happens.
  6. 11. - A substance that helps trap particles and microbes in the respiratory system.
  7. 13. - The flap that prevents food from entering the windpipe.
  8. 14. - The gas that is essential for respiration.
Down
  1. 1. - The process of breathing out.
  2. 4. - The windpipe that connects the throat to the lungs.
  3. 6. - The process of breathing in.
  4. 8. Exchange - The process of swapping oxygen and carbon dioxide in the lungs.
  5. 10. - The two organs responsible for gas exchange.
  6. 12. - The part of the body that filters and moistens the air we breathe.