Bio Cross word

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Across
  1. 3. these expand and contract when you breathe in and exhale
  2. 4. the main arteries
  3. 5. major air passage of the lungs
  4. 7. the hollow muscular organ that forms an air passage to the lungs
  5. 9. blood vessel that collects poor oxygen blood and returns it to the heart
  6. 13. an organ that flows blood through the circulatory system
  7. 14. you breathe this out after breathing in
  8. 15. the valve between the left atrium and left ventricle of the heart
Down
  1. 1. the space inside of your nose
  2. 2. connects the throat and the stomach
  3. 6. you breathe this every time you inhale
  4. 8. distributes blood to your body
  5. 10. extends from the larynx to the bronchial
  6. 11. artery transports oxygenated blood to the right side of the heart
  7. 12. you do this every day