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Key Terms
Muscular System
| Question | Answer |
|---|---|
| Adduction | moving a body part toward the midline |
| Abduction | moving a body part away from the midline |
| Cardiac muscle | forms the wall of the heart and contracts to circulate blood |
| Circumduction | Moving in a circle at a joint or moving one end of a body part oin a circle while the other end remains stationary, such as swinging an arm in a circle |
| Contract | nerves become short and thick |
| Contractability | muscle fibers that are stimulated by nerves coontract, which cause movement |
| Contractures | severe tightening of a flexor muscle resulting in bending at a joint caused by lack of use |
| Elasticity | Allowas the muscle to return to its original shape after it has contracted or streched |
| Excitability | irritability; the ability to respond to a stimulus such as nerve impulse |
| Extensibility | the ability to be streched |
| Extension | Increasing the muscle between two bones or straightening a body part |
| Fascia | A tough, sheetlike membrave that covers and protects the tissue |
| Flexion | decreasing the angle between two bones or bending a body part |
| Insertion | the end that moves when a muscle contracts |
| Involuntary | Muscle function without conscious thought or control |
| Muscle tone | state of partial contraction and is sometimes described as a state of readiness to act |
| Muscular System | made of over 600 muscles |
| Origin | When a muscle attaches to a bone, the end that does not move |
| Rotation | turning a body part around its own axis; for example,turning the head from side to side. |
| Skeletal muscle | It attaches to the bone and causes body movements |
| Tendons | Strong, though connective tissue cords that attach some muscles |
| Visceral(smooth) muscle | is found in the internal organs of the body (digestive,, respiratory systems, blood vessels and eyes) It contracts to cause movement in these organs |
| Voluntary | A person has control over these muscles |
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