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Across 1. Type of joint that can move in more than one direction (2 words) 4. Type of skeleton that is outside the body 5. Process which converts cartilage to bone 8. Where blood cells are made (2 words) 9. Where two bones attach 12. Type of tissue that makes up the skeletal system 13. Type of muscle tissue that is found only on the heart 14. Mineral that is stored in bones 16. Type of tissue that makes up the muscular system 17. Chemical fuel that organisms make in their cells 18. Type of muscle tissue that attaches to bone 19. Type of joint that does not move

Down 2. Type of skeleton that is inside the body 3. Type of signal that neurons use to communicate 6. Type of muscle tissue that is found on hollow organs 7. Basic structural unit of the nervous sytem 10. Tough outside layer of the bone 11. The skeleton is made out of bone, cartilage, and __________. 12. Soft connective tissue that does not have blood vessels 15. Type of neuron that connects the brain to skeletal muscles