| A | B |
|---|
| biceps | muscles on the inside upper arm |
| calcium | hard mineral that makes up bones |
| cartilage | hard, smooth, flexible material that covers the ends of bones |
| gliding joint | joint that allows bones to move up and down or in a circle |
| hinge joint | joint that allows only back and forth movement |
| immovable joint | joint that allows no movement |
| joint | the place where bones meet |
| ligament | cord that joins bones to other bones |
| marrow | spongy tissue made of fat and blood and found inside bones |
| pelvis | bucket-shaped part of the skeleton formed by the two hip bones |
| pivot joint | joint that allows for twisting movement |
| rib cage | part of the skeleton that protects the heart and lungs, made of twelve pairs of ribs |
| skeleton | the body's framework, made of over two hundred bones |
| skull | part of the skeleton that protects the brain, made of twenty-eight flat bones |
| sockets | openings in the skull that hold and protect the eyes |
| tendon | cord that joins muscle to bone |
| triceps | muscle on the back of the upper arm |
| voluntary muscle | muscle that is consciously controlled |
| ulnar nerve | funny bone |
| involuntary muscle | muscle thatis not consciusly controlled |
