Joints/tissue

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Across
  1. 2. connects bone to bone.
  2. 5. fights bacteria.
  3. 6. main organ in nervous system.
  4. 8. it is at the end of a bone.
Down
  1. 1. nerve cells travel up it to the brain.
  2. 2. in the respiratory system.
  3. 3. protects your lungs and heart.
  4. 4. takes oxygen around the body.
  5. 7. pumps blood around the body.
  6. 8. protects the brain.
  7. 9. connects muscle to bones.