Humans Transport Materials

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Across
  1. 5. the gas we inhale
  2. 6. the system that transports nutrients, gas, and other substances through blood
  3. 8. narrow tubes in the respiratory system that lead into the lungs
  4. 9. air travels through this tube in the respiratory system that is held open by C-shaped rings of tissue
  5. 15. the system that supplies our body with oxygen
  6. 16. the vessels that carries blood to the heart
  7. 17. small sacs at the end of the bronchioles where gas is exchanged
Down
  1. 1. tubelike passage of the respiratory system at the top of the throat that receives air, food, and liquids from our mouth and nose
  2. 2. the vessels that carries blood away from the heart
  3. 3. the name for the lower two parts of the heart where blood leaves
  4. 4. main organ of the respiratory system
  5. 7. the name for the upper two parts of the heart where blood enters
  6. 10. the heart is made of four of these
  7. 11. main organ of the circulatory system
  8. 12. large muscle below the lungs that contracts (moves down) when you breathe in
  9. 13. the gas we exhale
  10. 14. tiny tubes of the circulatory system where blood travels through