| A | B |
|---|
| skeleton | the inner framework made up of all the bones in the body |
| vertebrae | the small bones that make up the backbone or spine |
| joint | a place in the body where two bones come together or meet |
| What are the two kinds of joints? | immovable and movable |
| hinge, ball-and-socket, pivot, gliding | What are the four types of movable joints? |
| ligaments | strong connective tissue that holds the bones together in movable joints |
| cartilage | connective tissue that is more flexible than bone; covers the ends of the bones and keeps them from rubbing against each other |
| periosteum | a thin, tough membrane that covers alll of the bone except the ends |
| compact bone | a layer of hard and dense bone beneath the periosteum; contains many small canals carrying blood vessels and nerves to the living cells within the bone |
| spongy bone | the layer just inside the compact bone and found at the ends of the bones; the small spaces make the bones lightweight but strong |
| marrow | soft, connective tissue found in the spaces of the bones; some make blood cells and some stores fat as an energy reserve |
| osteoporosis | a condition in which the body's bones become weak and break easily |
