Ch. 11 Muscular System

Ch. 11 Muscular System - bone at the insertion exceeds the...

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Muscular System
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Producing Mvmts. Exert force on tendons Origin Insertion Action
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Producing Mvmts. Interaction of Skeletal Muscles Almost always function in groups Agonist (prime mover) Muscle responsible for a particular movement Synergists Muscles that contract assisting the prime mover Antagonists Resist a prime mover’s action and cause movement in the opposite direction. Relax when prime mover contracts
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Lever Systems Lever a rigid structure that can move around a fulcrum (fixed point) Acted on at two different points by two different forces: the effort which causes movement Muscular contraction the load or resistance which opposes movement Weight being moved or resistance to being moved
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Checkpoint: Collaborative Learning When does motion occur? Motion occurs when the effort applied to the
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Unformatted text preview: bone at the insertion exceeds the load Lever Systems 3 types of levers that differ on the positions of the fulcrum, effort, and load. First-class levers are not common: the fulcrum is between the effort and the load. Second-class levers are uncommon: the load is between the fulcrum and the effort. Third-class levers are common: the effort is between the fulcrum and the load. Muscle Arrangement All muscle fibers are parallel to one another within a single fascicle Fascicles form patterns with respect to the tendons Muscle Arrangment Power and range of motion Longer muscle fibers greater range of motion Increase cross sectional area greater power Naming MM....
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Ch. 11 Muscular System - bone at the insertion exceeds the...

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