SKELETAL SYSTEM

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Across
  1. 2. Made of vertebrae
  2. 6. Protects the heart and lungs
  3. 7. Hardest substance in the body
  4. 8. Longest bone in the body
  5. 9. Muscles which we cannot control
Down
  1. 1. Strong tissues that bind the bones at a joint
  2. 2. Made of 22 bones
  3. 3. Fatty substance inside the bone
  4. 4. Framework of bones
  5. 5. Fiber which attaches muscles to bone