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Across 2. joint where the bones have little to no movement. 4. painful irritation of the sac around the joint 7. found only in the heart 9. joint that has the most movement of any type of joint. 11. builds up in muscles during strenuos activity. 16. membranes around a joint produce a secretion to lubricate the joint. 18. strong fibrous bands that connect bone to bone. 19. inflammation or irritation of a joint. 20. consists of 33 bones and supports your head and neck. 21. a break in a bone.

Down 1. includes the bones in your head, chest, and back. 3. muscles gradually become weaker and weaker. 5. abnormal curvature of the spine. 6. overstretched or torn tendons. 8. a point at which two bone come together. 10. ends of the bones are forced out of their normal positions. 12. tough supportive tissue that is softer and more flexible than bone. 13. a painful irritation of a tendon. 14. slight, constant contraction of muscles. 15. joint where one bone rotates around another. 17. the thick, hard part of the skill that encloses the brain and protects it.