Slide 1Slide 2Sliding Filament TheoryLength-tension RelationshipSlide 5Velocity-tension RelationshipMotor Unit = Neuron and all muscle fibers it innervatesSynapse = gap between neuron and muscle fiberIE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #2IE 5532Muscle StructureIE 5533Sliding Filament Theory•Thick & thin filaments slide over one another•Shortening distance between z-lines•Crossbridges - bonds between myosin head and globular actin•Requires energy in form of ATP molecule•Initiated by Ca++ ions releasing inhibition•Produce several basic propertiesIE 5534Length-tension RelationshipTension greatest at midrangeIE 5535•Weightless astronaut •Relaxed posture•No muscle forceWhere is midrange?IE 5536Velocity-tension RelationshipTension greatest at slow motions (isometric tension)IE 5537Motor Unit =Neuron and all muscle fibers it innervatesAll-or-none principleInnervation ratioIE 5538Synapse = gap between neuron and muscle
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