| A | B |
|---|
| homeostasis | xxxx |
| skeletal system | section 2 |
| osteoblasts | living cells that deposit minerals in bone |
| compact bone | bone without any visible spaces; rigid and dense |
| spongy bone | bone tissue that has many open spaces; provides strength and support for most bones |
| marrow | soft tissue found in bone |
| red marrow | produces red and white blood cells |
| yellow marrow | stores fat; found in the central cavity of long bones |
| joint | xxxx |
| ligaments | hold together joints; strong, elastic bands of connective tissue |
| osteoporosis | disease that causes bones to become less dense |
| muscular system | section 3 |
| cardiac muscle | found only in your heart |
| skeletal muscle | attached to bones for movement; helps to protect inner organs |
| voluntary muscle | muscle that is under your control |
| involuntary muscle | muscle that is under the control of your nervous system |
| smooth muscle | found in the digestive tract and in the walls of your blood vessels |
| flexor | a muscle that bends part of your body |
| extensor | a msucle that straightens part of your body |
| strain | injury in which a muscle or tendon is overstretched or torn |
| tendinitis | injury in which a tendon becomes inflamed from overuse |
