body system

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Across
  1. 4. tube that splits air into the lungs
  2. 5. tiny sacs on the lungs where oxygen enters blood
  3. 8. blood cells fight infections in body
  4. 10. system a bunch of organs that work together to complete major functions
  5. 11. Specialized cells that complete the same tasks
  6. 13. structure composed by tissue
  7. 14. a change in the environment that the body responds to
Down
  1. 1. tube for air
  2. 2. muscle that enables breathing
  3. 3. blood cells carry oxygen
  4. 6. bring oxygen into the body and carbon dioxide out
  5. 7. pieces of old cells that clot when bleeding
  6. 9. action completed in response to the stimulus
  7. 12. material that holds the other parts together