Skeletal System

5. any of the minute tubes that form a network in bone and contain blood vessels.
7. freely movable joints exhibiting a joint cavity enclosed by a fibrous capsule lined with synovial membrane
9. Hard and dense, but not solid, bone tissue that is beneath the outer membrane of a bone.
11. allow only slight movement and consist of bones connected entirely by cartilage
13. shaft of a long bone
16. found in cancellous (spongy) bone; produces red and white blood cells and platelets
17. cartilaginous area at the ends of long bones where lengthwise growth takes place in the immature skeleton, and gradually ossifies
19. a bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted.
21. mineral salts, 65% of bone by mass, Mainly calcium phosphate crystals, Responsible for hardness and resistance to compression in bones
23. Portion of the skeletal system that consists of the skull, rib cage, and vertebral column
24. formation of blood cells
25. found in the medullary canal and functions as storage for fat tissue; is inactive in the formation of blood cells; gradually replaces red bone marrow in adult bones
26. Protects and supports body organs and provides a framework the muscles use to support movement. Made up of bones and joints
27. consists of inflexible layers of dense connective tissue, holds the bones tightly together; immovable

1. process of bone formation
2. ends of long bone
3. Concentric rings made up of groups of hollow tubes of bone matrix (plural of lamella)
4. Hairlike canals that connect lacunae to each other and the central canal
6. A hormone of the parathyroid gland that regulates the metabolism of calcium and phosphorus in the body.
8. covers the surfaces of bones where they come together to form joints
9. mature cartilage cells
10. A dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles.
12. cell that breaks down bone
14. cavity within the shaft of the long bones filled with bone marrow
15. Layer of bone tissue that has many small spaces and is found just inside the layer of compact bone; also called cancellous bone
18. Bones of the limbs and limb girdles that are attached to the axial skeleton
20. structural and functional units of compact bone; contain lamellae, canaliculi, lacunae, and Haversian canal
22. bone forming cells
28. unmineralized bone matrix (resembles bone)