The human body

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Across
  1. 5. whith the respiratory system you can
  2. 6. the brain and the spinal cord are called
  3. 9. special sheet of muscle under your lungs
  4. 10. whose job is to perform operations
Down
  1. 1. the knee and wrists are
  2. 2. produces a chemical product called insulin
  3. 3. fight against germs and invaders
  4. 4. bring used blood back to the heart
  5. 7. tubes which carry blood
  6. 8. blood flows through the body and gives up