biology respiratory system

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Across
  1. 3. the main organ in respiratory system
  2. 4. when we breathe in, air enters the respiratory system through the...
  3. 6. the dome-shaped muscle below the lungs
  4. 9. causes you to have low stamina
  5. 11. the action to intake oxygen
  6. 12. disease where there is uncontrolled growth of cells in the lungs
  7. 14. the action to let out air
  8. 15. what do we exhale
  9. 18. the external respiration process where air moves into and out of the lungs
  10. 19. causes addiction to smoking
  11. 20. in the chest, the trachea branches into two...
  12. 21. our lungs are protected inside the ribcage that consists of the
  13. 22. thoracic cavity is seperated from the abdominal cavity by a muscular sheet known as the
Down
  1. 1. damage of the alveoli in the lungs caused by smoking
  2. 2. inflammation of the bronchi
  3. 5. each bronchus splits into smaller tubes called
  4. 7. also known as the windpipe
  5. 8. the lungs are in a space called
  6. 10. the tiny air sacs in the lungs
  7. 13. the health issue when you have high blood sugar
  8. 16. disorder in which the air passage of lungs become too narrow
  9. 17. the primary muscle involved in breathing