science crossword

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Across
  1. 3. pumps blood
  2. 5. blood vessels that exchange substances with cells
  3. 10. where oxygen goes
  4. 12. muscles that help your lung pull air in and push air out
  5. 15. to absorb nutrients from food
  6. 16. blood vessels that take blood away from the heart
  7. 17. blood vessels that take blood to the heart
  8. 18. produces enzymes and controls our energy reserves
  9. 19. voice box
  10. 20. small branches that lead to each lung
Down
  1. 1. bottom chamber of the heart
  2. 2. tiny air sacs at the end of the bronchiole
  3. 4. you breathe out
  4. 6. throat
  5. 7. 1 of 4 valves that control blood flow in the heart
  6. 8. you have 2 of
  7. 9. top chamber of your heart
  8. 11. you breathe in
  9. 13. the main artery that carries blood away from the heart to the rest of your body
  10. 14. moves blood and nutrients around the body