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Kin 340 Biomechanics- Chatper 6
The Biomechaincs of Skeletal Muscle
30
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Undergraduate 2
05/07/2012

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Term
excitability
Definition
ability to receive and respond to stimulus.
Term
Contractilty (irritability)
Definition
ability of a muscle to contract and produce force.
Term
Extensibility
Definition
ability of a muscle to stretched with out tissue damage.
Term
elasticity
Definition
ability of a muscle to return to its original shape after shortening or extension.
Term
epimyosium
Definition
tough coat that covers entire surface of muscle belly. Tightly woven bundles of mostly collagen fibers with some elastin. Separates the individual muscle from each other and provides structural integrity for the whole muscle.
Term
perimysium
Definition
divides muscles into bundles or fascicles. Provides pathway for major blood vessels and nerves.
Term
endomysium
Definition
surrounds each of the fibers.
Term
Myotendinous attachment
Definition
as muscle fibers approach their tendons they taper down by as much as 90%. The muscle membrane of this area is highly folded increasing the surface area of the attachment.
Term
angonist
Definition
acts to cause a movement
Term
antagonist
Definition
acts to slow or stop a movement.
Term
stabilizer
Definition
acts to stabilize a body part against some other force.
Term
neutralizer
Definition
acts to eliminate an unwanted action produced by an agonist.
Term
synergist
Definition
acts to perform the same action as another muscle.
Term
concentric
Definition
fibers shorten
Term
eccentric
Definition
fibers lengthen
Term
isometric
Definition
no length change
Term
contractile component
Definition
muscle property enabling tension development by stimulated muscle fibers
Term
electromechanical delay
Definition
time between arrival of a neural stimulus and tension development by the muscle
Term
fast-twitch fiber
Definition
a fiber that reaches peak tension relatively quickly
Term
motor unit
Definition
a single motor neuron and all fibers it innervates.
Term
parallel elastic component
Definition
passive elastic property of muscle derived from the muscle membranes
Term
parallel fiber arrangement
Definition
patterns of fibers within a muscle in which the fibers are roughly parallel to longitudinal axis of the muscle.
Term
passive insufficiency
Definition
inability of a two joint muscle to stretch to the extent require to allow full range of motion at all joints crossed.
Term
pennate fiber arrangement
Definition
pattern of fibers within a muscle with short fibers attaching one or more tendons
Term
series elastic component
Definition
passive elastic property of muscle derived from the tendons
Term
slow twitch fiber
Definition
a fiber that reaches peak tension relatively.
Term
stretch shorting cycle
Definition
eccentric contraction followed immediately by concentric contraction.
Term
summation
Definition
building in a additive fashion
Term
tetanus
Definition
state of muscle producing sustain maximal tension result from repetitive stimulation.
Term
viscoelastic
Definition
having the ability to stretch or shorten over time.
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