RESPIRATORY SYSTEM

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Across
  1. 4. SMALL BLOOD VESSELS.
  2. 5. BRANCHES THAT CONNECT THE WINDPIPE TO THE LUNGS.
  3. 6. TAKING IN AIR TO THE LUNGS.
  4. 8. WHEN WASTE GAS LEAVES THE LUNGS.
  5. 10. ANOTHER NAME FOR THROAT.
  6. 11. SMALL AIR SACS INSIDE THE LUNGS.
  7. 16. WHEN CELLS RELEASE ENERGY.
  8. 17. THE RESPIRATORY & DIGESTIVE SYSTEMS USUALLY START HERE.
  9. 19. MUSCLES BETWEEN THE RIBS.
  10. 20. PART OF THE CELL WHERE RESPIRATION TAKES PLACE.
Down
  1. 1. THE ACT OF INHALING AND EXHALING AIR.
  2. 2. THE GAS IN THE AIR THAT CELLS NEED.
  3. 3. SYSTEM THAT CONTROLS BREATHING.
  4. 7. THE VOICE BOX.
  5. 9. THE FLAP OF TISSUE THAT KEEPS FOOD OUT OF THE AIRWAY.
  6. 12. MAIN ORGANS FOR BREATHING.
  7. 13. CARRIES OXYGEN TO THE CELLS.
  8. 14. THE WINDPIPE.
  9. 15. BONES THAT PROTECT UPPER ORGANS.
  10. 18. MUSCLE THAT WORKS THE LUNGS.