| A | B |
|---|
| involuntary muscles | a muscle that is not under conscious control |
| voluntary muscles | a muscle that is under conscious control |
| skeletal muscles | a muscle that is attached to bones |
| tendon | strong connective tissue that attached muscle to bone |
| smooth muscle | involuntary muscle that is found inside many internal organs |
| cardiac muscle | muscle tissue found only in the heart |
| vertebrae | 26 bones that make up your backbone |
| marrow | soft tissue that fills the internal spaces in bone |
| cartilage | connective tissue that is more flexible than bone and that gives support to some parts of the body |
| joint | a place where two bones come together |
| ligament | strong connective tissue that holds together the bones in a movable joint |
| osteoporosis | a condition in which the body's bones become weak and break easily |
| fracture | a break in bone |
| sprain | an injury in which the ligaments are stretched too far and tear |
| dislocation | an injury in which a bone comes out of its joint |
| x-ray | a form of energy that travels through some living tissue but not through bone |
| magnetic resonance imaging | a method for taking clear images of both bone and soft tissues of the body |
| epidermis | the outer layer of the skin |
| melanin | a pigment that gives skin its color |
| dermis | the lower layer of the skin |
| pores | an opening through which sweat reaches the surface of the skin |
| follicles | structures in the dermis from which the hair grows |
| acne | a bacterial infection of the skin in which the oil glands become blocked and swollen |
