| A | B |
|---|
| skeletal system | framework of your body |
| marrow | fatty tissue in the spongy bone |
| fracture | a break in the bone |
| joint | place where two or more bones meet |
| immovable joint | joint that allows little or no movement |
| hip | ball and socket |
| muscle | organ that contracts and gets thorter |
| voluntary muscles | muscles you control |
| involuntary muscles | muscles you can't control |
| skeletal muscles | muscles that are attached to the bone |
| epidermis | upper layer of your skin |
| melanin | pigment that gives your skin color |
| dermis | layer of tissue under your epidermis |
| hinge joint | joint that moves back and forth like a hinge |
| cartilage | thick,smooth tissue at the end of your bones |
| ligament | thick bands of tissue that holds bones to the joints |
| skull | immovable joint |
| elbow | hinge joint |
| vertebrae | gliding joint |
| arm | pivot joint |
