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13. Yellow bone marrow contains a large percentage of ________.        

36. A rare genetic disorder that causes soft tissues to transform permanently into bone. This occurs when the bones grow abnormally in the muscles, tendons, ligaments and other connective tissues, forming bridges of extra bone across the joints. This disorder is known as ________________.        

25. Both actin and myosin are found in the ________.        

32. Prevention of osteoporosis includes adequate intake of ________.        

39. If a muscle is flooded with calcium and no ATP is present, the best explanation would be _____________________.

8. The contractile units of skeletal muscles are ________.        

37. The femur is the largest and strongest bone in the body.

23. Bones are covered and lined by a protective tissue called the periosteum. The inner (osteogenic) layer consists primarily of ________.        

38. All of the bones of the skull, except the mandible, are united by sutures and are therefore immovable.

16. The central (Haversian) canal that runs through the core of each osteon is the site of ________.