body system

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