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skeletal
| Question | Answer |
|---|---|
| fasicles | bundles of muscle fibers |
| fascia | covered by muscles |
| origin | stationary bone |
| insertion | bone that moves; muscles pull when contracted |
| agonist | muscles that do most of the work |
| synergists | muscles that assit the prime mover |
| antagonist | muscle that acts opposite to an agonist |
| sarcolemma | plasma membrane |
| sarcoplasm | cytoplasm |
| sarcoplasmic reticulum | ER (endoplasmic reticulum) |
| t tubules | penetrate into the cells |
| myofibrils | contractile protiens of the muscle fibers. |
| z line | ends of sarcomeres |
| i band | contain thin actin myofilaments |
| a band | overlapping actin and myosin myofilaments |
| h zone | centered within a band |
| fast twitch muscles | designed for strength; provide explosions of energy |
| slow twitch muscles | more stamina |