Mechanics of Movement II

Mechanics of Movement II - Mechanics of Movement II Muscle...

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Frolich, Human Anatomy, Mechanics of Movement Mechanics of Movement II: Muscle Action Across Joints Review muscle force generation Muscle Physics --force versus cross section --length versus strain Lever mechanics Stabilizing the joint—isometric and eccentric contraction
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Frolich, Human Anatomy, Mechanics of Movement Muscle Structure Review Muscle fiber = muscle cell Fibers lined up = direction of pull Tendon attaches to bone Muscle pulls on bone Fig. 10.1
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Frolich, Human Anatomy, Mechanics of Movement Muscle Origin and Insertion Origin Proximal Fixed Insertion Distal Moves (usually!!) Fig. 10.3
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Frolich, Human Anatomy, Mechanics of Movement Mechanics of Contraction Muscle cell is unit Role of actin/myosin Action potential or depolarization of membrane makes cell “contract” ( motor neuron action potential stimulates muscle membrane depolarization) Fig. 10.4
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Frolich, Human Anatomy, Mechanics of Movement Visualizing muscle contraction Fig. 10.7 How actin- myosin  complex  ( sarcomere ) shorten muscle
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Frolich, Human Anatomy, Mechanics of Movement Summary of Muscle Organization/Function
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Frolich, Human Anatomy, Mechanics of Movement Summary of Muscle Organization/Function
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Frolich, Human Anatomy, Mechanics of Movement Summary of Muscle Organization/Function
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Frolich, Human Anatomy, Mechanics of Movement Table 10.2 Levels of Muscle Organization
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