| A | B |
|---|
| 206 | This is the number of bones in the adult human body |
| compact bone | This bone is dense and looks smooth |
| spongy bone | This type of bone is much less compact and has many small open spaces that make bone lightweight |
| long bones | These bones include the limb bones and are mostly compact bone |
| short bone | These are the bones of the wrists and ankle. They are generally cube shaped |
| flat bones | These are the bones of the skull, ribs, and sternum. They are generally thin, flattened, and usually curved |
| irregular bones | These types of bones don't fit other categories. They include the vertebrae |
| periosteum | This is the tough, tight fitting membrane that covers bone and is important in growth and repair of bone |
| osteoblasts | These bone cells deposit calcium and phosphorus that make bone tissue hard |
| osteoclasts | These bone cells break down bone tissue and release calcium and phosphorus when needed |
| joints | Any place where two or more bones meet |
| ligaments | Tissue that holds bones together at joints |
| immovable joint | This type of joint allows little or no movement (eg. skull, and pelvis) |
| movable joint | These types of joints allow wide range of motion and include several types |
| gliding | This is the most common type of joint in the human body |
| ball-and-socket joint | This type of joint has rounded end that fits into cuplike cavity of another bone |
| arthritis | This type of disorder includes over 100 different inflammatory or degenerative diseases that damage the joints |
| osteoarthritis | This is the most common form of arthritis |
| osteoporosis | This is a loss of bone mass leading to thin, fragile bones (common in aging, especially in women) |
| rickets | This is a disease of children in which bones fail to calcify (due to lack of calcium in diet) |
