human body by moses

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Across
  1. 5. upper part of the heart
  2. 6. a collection of tissues working together
  3. 8. lower part of the heart
  4. 10. a group of organs working together to create a system
  5. 12. pathway air takes to the alveoli
  6. 14. filters your blood
  7. 15. an organ that exchanges oxygen and carbon dioxide with the blood
Down
  1. 1. tubes that branch off of the larger bronchi
  2. 2. a group of cells that perform the same function
  3. 3. large flat muscle that helps you breath
  4. 4. small units in the kidney that filter the blood
  5. 7. tiny sacs in your lungs that exchange the oxygen
  6. 9. takes blood to the heart
  7. 11. takes blood away from the heart
  8. 13. the smallest life form