Ch. 45 Section 3 Vocabulary
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17 terms
Terms | Definitions |
|---|---|
 Muscle fiber | elongated cells that make up skeletal muscle tissue |
| Striation | light and darks strips that muscle fiber is crossed by |
| Fascicle | skeletal muscle fibers are grouped into dense bundles, combined with connective tissue to make muscle |
| Voluntary muscle | contractions can usually be consciously controlled. Skeletal muscle |
| Involuntary muscle | movements that cannot be consciously controlled. Smooth muscle |
| Myofibril | threadlike structures made of protein filaments myosin and actin |
| Myosin | thick filaments, have heads |
| Actin | thin filaments, beadlike |
| Z line | structure that actin filaments are anchored at their endpoints |
| Sarcomere | region from one Z line to the next. functional unit of muscle contraction |
| Tendon | tough fibrous cord of connective tissue |
| Origin | point where the muscle attaches to the stationary bone |
| Insertion | point where the muscle attaches to the moving bone |
| Flexor | a muscle that bends a joint (biceps) |
| Extensor | a muscle that straightens a joint (triceps) |
| Muscle fatigue | physiological inability of a muscle to contract |
| Oxygen debt | temporary lack of oxygen availability |
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