Respiratory System Crossword

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Across
  1. 3. Also called the windpipe, it carries air to the lungs.
  2. 6. A sticky substance that traps dust and germs.
  3. 9. Another word for breathing out.
  4. 10. A muscle that moves to help with breathing.
  5. 15. The body system responsible for gas exchange.
  6. 16. Tiny sacs where oxygen enters the blood.
  7. 18. Another word for breathing in.
  8. 19. Smaller air tubes within the lungs.
Down
  1. 1. Large tubes branching from the trachea into the lungs.
  2. 2. Muscles between the ribs that help with breathing in and out.
  3. 4. Bones that shield the heart and lungs.
  4. 5. Rib muscles that help with breathing in.
  5. 7. Tiny hairs that move mucus out of the airways.
  6. 8. A flap that prevents food from entering the windpipe.
  7. 11. A process that releases energy from food.
  8. 12. The part of the throat that produces sound.
  9. 13. respiration A type of respiration that requires oxygen.
  10. 14. A microorganism that causes illness.
  11. 17. Rib muscles that help with breathing out.