| A | B |
|---|
| joint | a place in your body where two or more of your bones come together |
| cartilage | a tough supportive tissue that is softer and more flexible than bone |
| ossification | minerals, such as calcium and phosphorus, are deposited within the developing bone, making it hard |
| marrow | a type of tissue that fills the spaces in bones; two types, yellow and red |
| ligament | strong, fiborus bands that hold bones together |
| osteoporosis | a condition in which the bones become weak and break easily |
| fracture | a break in a bone |
| sprain | an overstretched or torn ligament |
| dislocation | the ends of the bone in a joint are forced out of their normal positions |
| scoliosis | an abnormal curvature of the spine |
| smooth muscle | involuntary muscle that causes movements within your body |
| cardiac muscle | involuntary muscle that is found only in the heart |
| skeletal muscle | muscles that you controlto do activities, such as walk or play a musical instrument |
| tendon | a thick strand of tissue that attaches a muscle to a bone |
| muscle tone | slight tension in the muscle caused by contractions that are not strong enough to cause movement |
| atrophy | a condition caused by muscles that cannot contract due to injury and are not used often; muscles will weaken and shrink |
| anabolic steroid | artificial forms of the male hormone testosterone |
| strain | pulled muscle |
| tendonitis | condition caused by the overuse of tendons; painful swelling and irritation |
| neuron | a type of cell that is the basic unit of the nervous system |
| cerebrum | consists of several specialized regions that receive messafes from sense organs, controls movement, memory, communication, and reasoning |
| cerebellum | coordinates your body's movements and helps you keep your balance |
| brain stem | the midbrain, pons, and medulla; controls many of your body's involuntary actions, such as breathing and sneezing |
| spinal cord | a thick column of nerve tissue that links the brain to most of the nerves in the peripheral nervous system |
| reflex | automatic response to your environment |
| concussion | bruiselike injury to the brain |
| coma | a prolonged period of deep unconsciousness |
| paralysis | the loss of the ability to move and feel some part of the body |
| meningitis | infection that causes inflammation of the membranes surrounding the brain and spinal cord |
| seizure | an episode of erratic nerve impulses in the brain that may lead to a loss of consciousness, muscle spasms, and other uncontrollable symptoms |
| epilepsy | a condition in which a person is prone to seizures |
