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# Muscles Part 2 |
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## muscle tension |
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* isotonic, movement |
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* concentric - shorten |
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* eccentric - lengthen |
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* isometric, no movement |
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always needs nervous system input |
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difference between stability and movement basically |
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## Motor units and recruitment |
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neurons that go to specific fibers |
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motor unit - plus muscle fibers that it communicate with. allows for changing value of force used. |
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activate muscles in rotation - so we avoid over stressing |
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dont use till it is no longer working. just rotate so that the transitions are less jaring |
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## Muscles rarely completly relax |
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muscle tone when not flexing is because of higher muscle density |
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hypertonia - too few recruited muscles (unable to move) |
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hypertonia - too muchj muscle stress (unable to relax) |
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## Skeletal Muscle Movement |
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* form dictates function |
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* muscles are attached to bones to allow for movement |
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* muscle origin - anchor point (bicept on the humerous /scapulus) |
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* muscle insertion - (bicept to radius) |
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you will have a chart of origin, insertion, action |
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elbow hinge joint |
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muscles are with joints |
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## Muscles (almost) never work alone |
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* aiding, opposite work together |
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prime mover/ agonist -> main muscle moving things |
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synergist -> assits movement |
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antagonist -> opposite movement of agonist |
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* maintains body position |
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* needed for rapid movement |
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