biology

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Across
  1. 3. one of two openings where you breath from
  2. 5. filters urea
  3. 8. tube tubes at the bottom of your windpipe that connect to each lung
  4. 14. tiny air sacs in the lung where the exchange of oxygen and carbon dioxide take place
  5. 15. of cartilage the trachea has these rings that serve as protection
  6. 16. thin sacs that surround each lung
  7. 17. one of two openings where you breath from
  8. 18. pumps blood
  9. 19. holds food
  10. 20. hold air
Down
  1. 1. small tubes of the bronchial that lead to the alveoli
  2. 2. takes blood away from heart
  3. 4. bladder stores urine until ready to excrete
  4. 6. increases the surface
  5. 7. tissue flaps at the entrence trachea that closes when you swallow
  6. 9. bones that protect your lungs
  7. 10. hallow organs that allows you too talk
  8. 11. pushes food down
  9. 12. muscle that helps your lungs pull in and push out air
  10. 13. absorbs water