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21 Cards in this Set

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