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