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45 Cards in this Set

  • Front
  • Back
It is usual for a skeletal muscle fiber to extend from ____ to _____.
insertion, origin
Each muscle fiber is innervated by only one ____ and has one ____.
neuron, motor end plate
A presynaptic action potential _____ induces a ___ in the skeletal muscle cell.
always, AP
Similar to nerve cells, the skeletal muscle cell resting potential is near the ___ equilibrium potential and its action potential approaches the ____ equilibrium potential.
K+, Na+
In skelental muscle the action potential is ____ in duration that that of a neuron.
Skeletal muscle fibers do not have the _____ and _____ afterpotentials typical of neurons.
hyperpolarizing, depolarizing ( no oscilltation at the end)
The absolute value of the force that is exerted by a muscle on its origin and insertion that are ____ in value but _____ in direction is called the _____.
equal, opposite, tension
The force against which a muscle acts is called the ____.
If the tension exceeds the load the muscle will ____, while if the tension is less than the load the muscle will ____.
shorten, lengthen
If the tension is equal to the load, the muscle will ____.
not change
When an AP passes along a skeletal muscle fiber, the muscle _____, meaning the ____ increase.
contracts, tension
When a joint is flexed the flexor muscle ____, while the extensor muscle _____.
shortens, lengthens
When a joint is extended the flexor muscle ____, while the extensor muscle _____.
lenthens, shortens
____ refers to the activation of the muscle mechanism that increases force or tension exerted by the muscle.
A relaxed muscle can still exert a ____, however its ____ is less than in a contracted muscle.
force, tension
Tension will ____ with increasing length of a muscle.
The tension developed by a relaxed muscle.
passive tension
The greatest length a muscle can have in the body
rest length
____ contraction is contracting a muscle without letting its length change.
____ tension is due to the CT and components of the muscle itself, while ____ tension increases because of the contractile machinery.
passive, active
Total tension is equal to ____ tension plus ____ tension which can not be measure itself.
passive, active
Total tension reaches a maximum at ____ length.
Up to rest length total tension is mainly due to ____ tension.
After rest length total tension first ____ because ____ tension _____ and then ______ because ____ tension ______.
decrease,active, decreases,increase, passive, increases
A gastrocnemius developes more tension than a maseter because it has a _____.
larger cross sectional area
In the body, isometric tension _____ with increasing length.
In the body, increasing tension with length is necesary for _____, so that the ____ can adapt to adjustments.
stability, CNS
Load is the external force that acts against ____ of the muscle.
____ contraction is allowing the muscle to shorten at a constant load.
When the load equals tension the muscle will _____ and the velocity will equal ____.
not shorten, zero
When the load exceeds tension the muscle will _____.
With a load, the velocity of shortening depends on ____, and increases with increasing ____.
tension, length
The tension in the resting muscle is the ____, while the force of a load is called the ____.
preload, afterload
In general ____ rest lengths produce greater _____ velocities.
greater, shortening
When the tension is greater than the afterload the muscle _____.
If the afterload exceeds the tension the muscle _____, even though it is _____.
lengthens, contracting
When tension is equal to load the contraction is ____.
Power is defined as the ____.
the rate at which a muscle does work on a load
When the load(F) is zero, the work is ____ and the power production is ___.
When the contraction is isometric, the ___ is equal to the ____, so the distance is ____, and the power production is ____.
load, tension, 0, 0
Maximum power production must occur between a load of ____ and a _____ equal to tension.
0, load
Maximum power production occurs when the load is about _____% of the load needed to produce an ____ contraction.
30, isometric
When the muscle is stretched so that there is no overlap between think and think filaments, no ____ is developed.
active tension
____ tension develops as thick and thin filaments are allowed to ____.
active, overlap
Tension is ____ to thick and thin filament overlap, until they reach _____.
directly proportional, the middle of the thick filament, where there are no cross bridges