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55 lines
1.3 KiB
55 lines
1.3 KiB
# 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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