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21 Cards in this Set
- Front
- Back
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purpose of muscular system
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to enable the bones to move at the joints
to provide strength and protection to the skeleton by distributing loads and absorbing shick |
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muscle properties
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extensibility
elasticity contractility |
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extensibility
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the ability to be passively stretched
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elasticity
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the ability to reform after deformation
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contractility
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the ability to actively shorten
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pathways of contraction
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electircal pathways
chemical pathways energy pathways mechanical pathways |
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structures of muscle fiber
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longitudinal/parallel
fusiform/spindle fan/triangle/radiate shaped penniform |
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longitudinal/parallel
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muscle whose fibers lie parallel to its long axis
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fusiform/spindle
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rounded muscle which tapers at either end
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fan/traingle/radiate
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flat type of muscle whose fibers radiate from a norrow attatchment at one endto a broad attachment at the other
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penniform
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muscle fibers arranged in a feather like pattern
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machines in the body
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pulley
lever wheel and axle |
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class 1 pulley
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an improved angle of pull comes from the muscle tendon passing over an external support
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class 2 pulley
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the action of the muscle at the joint is altered because of the pulley
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class 3 pulley
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the joint itself serves as a pulley if the tendon passing over the joint gains a more favorable angle of pull
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class 4 pulley
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the muscle wraps around the pulley causing the pulley to rotate
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class 5 pulley
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the muscle acts as its own pulley or uses another muscle as a pulley to improve the angle of pull
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wheel and axle
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provide mechanical advantage in force, increase in speed movement, and range of linear motion
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class 1 lever
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-axis at some location between the force point and the resistance point-performs all four machine functions
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class 2 lever
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resistance point at some location between the force point and the axis
-FA always greater than the RA -only favors force production |
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class 3 lever
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-force point at some location between the resistance point and the axis
-RA greater than FA -advantage in range of motion and speed of movement |
