Human Body Systems

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Across
  1. 3. Small blood vessels surrounding the alveoli
  2. 4. The body system that helps us breathe
  3. 7. The place where air is warmed, moistened, and filtered
  4. 9. Tiny tubes inside the lungs that lead to alveoli
  5. 12. The voice box
  6. 14. Tubes that branch off from the trachea into the lungs
  7. 15. The flap that keeps food out of the lungs
  8. 17. Breathing air out of the body
  9. 18. Protein in red blood cells that carries oxygen
  10. 19. Movement of oxygen from air sacs into the blood
Down
  1. 1. Muscle under the lungs that helps you breathe
  2. 2. substance that traps dust and germs
  3. 5. The tube that carries air to the lungs
  4. 6. Tiny air sacs where gas exchange happens
  5. 8. Gas waste breathed out of the body
  6. 10. Gas we need to survive
  7. 11. Part of the throat where air and food pass
  8. 13. Breathing air into the body
  9. 16. hair-like structures that move mucus out of the airway