| A | B |
|---|
| skeletal system | framework of bones & other parts |
| marrow | tissue inside bones that makes blood cells or stores fat |
| ligament | tissue that holds bones together |
| cartilage | tissue that pads the ends of bones and holds some bones together |
| joint | place where two bones come together |
| ball-and-socket joint | allows circular movements, e.g. shoulder |
| hinge joint | allows open/shut movements, e.g. knee |
| pivot joint | allows back and forth turning movements, e.g. neck |
| gliding joint | allows sliding and twisting movements, e.g. wrist |
| fixed joint | does not allow movement, e.g. skull |
| tendon | tissue that connects muscle to bone |
| contract | muscle is short and hard |
| relax | muscle is long and thin |
| voluntary muscle | can be controlled with thought |
| involuntary muscle | works without person thinking about it |
| protein | nutrient used for cell growth and repair |
| carbohydrate | nutrient used for energy |
| calcium | helps bones grow strong and hard |
| cramp | hard, painful muscle contraction |
| strain | damage caused by stretching a muscle too far |
| sprain | damage to tissues around a joint caused by a hard twist |
| fracture | breaking of bone or cartilage |
| gland | body organ that makes chemicals |
| pituitary gland | gland that controls growth |
| growth hormone | growth-controlling chemical made by pituitary gland |
| growth spurt | period of rapid growth beginning between ages 9 and 12 |
