Skeletal/Muscel system

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Across
  1. 2. a soft type of bone where blood cells are made
  2. 5. The opposite of an endoskeleton
  3. 6. these bones protects the brain
  4. 7. This occurs here 2 bones meet
  5. 8. Muscles work by doing this
  6. 9. bone is made of this element
Down
  1. 1. muscles that work in pairs
  2. 3. one of the uses of the skeleton
  3. 4. the longest bone in the human body