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AP MOD. II-Muscular
| Term | Definition |
|---|---|
| skeletal muscle | striated or voluntary muscle |
| cardiac muscle | heart muscle |
| smooth muscle | nonstriated, involuntary muscle |
| origin | part of muscle that attaches to the bone-fixed |
| insertion | part of muscle that attaches to the bone that moves |
| body | main part of muscle |
| prime mover | muscle whose contraction is mainly responsible for producing a given movement |
| synergist | muscle whose contractions help the prime mover |
| antagonist | muscle whose actions oppose the action of the prime mover |
| tonic contractions | produce no movement of body parts, maitain posture |
| fatigue | reduced strength of muscle contraction |
| oxygen debt | metabolic effort required to burn excess lactic acid accumulated during prolonged exercise |
| atrophy | decrease in muscle size due to disuse |
| hypertrophy | increase in muscle size due to regular exercise |
| isotonic contractions | produces movement at a joint, muscle changes length |
| isometric contractions | do not produce movement, muscle does not shorten |
| twitch contractions | quick, jerky responses |
| tetonic contractions | sustained and steady contractions |
| flexion | decreases angle between two bones and joint, bending |
| extension | increases angle between two bones and joint, straightening |
| abduction | movement of part away from midline of body |
| adduction | movement of part toward midline of body |
| myopathies | muscle disorders |
| cramps | painful muscle spasms |
| Poliomyelitis | viral infection |
| Duchenne muscular dystrophy | genetic disorder characterized by rapid progression of weakness and atrophy |
| Myasthenia gravis | autoimmune muscle disease characterized by weakness and chronic fatigue |