The flashcards below were created by user
lcunrod7
on FreezingBlue Flashcards.
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what is a a single stimulus-contraction- relaxation sequence in a muscle fiber
muscle twitch
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depending on what factors can a muscle twitch vary
type, location, internal and external conditions, and other factors
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what can be viewed on a myogram
muscle twitch
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what are the three phases of a muscle twitch
latent period, contraction period, relaxation period
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what twitch phase has action potential that sweeps across sarcolemma
latent period
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what twitch phase has SR release of calcium ions
latent peirod
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what twitch phase has contraction cycle has not begun
latent period
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what twitch phase has tension rises to peak
contraction phase
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what twitch phase has calcium binds to troponin allowing cross-bridge formation between myosin head and active site on actin
contraction phase
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what twitch phase has calcium levels fall
relaxation phase
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what twitch phase has active sites covered by tropomyosin
relaxation phase
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what twitch phase has number of cross-bridges decline with detachment
relaxation phase
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What are the two factors determining the amount of tension produced by a skeletal muscle
the amount of tension produced by each muscle fiber, and total number of muscle fibers stimulated
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what effects of stimulation frequency on tension stimulate of skeletal muscle fiber immediately after relaxation phase produces increasing maximum tension
treppe
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what effects of stimulation frequency on tension continues for the first 30-50 stiumulations
treppe
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what effects of stimulation frequency on tension is in most skeletal muscles do not demonstrate this
treppe
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what effects of stimulation frequency on tension is a stiumulation of skeletal muscle fibers before relaxation phase completion produces increasing maximum tension
wave summation
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what effects of stimulation frequency on tension have duration of twitch determines maximum time avaliable to produce this
wave summation
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what effects of stimulation frequency on tension is convulsive tension and wave summation producing almost peak tension
incomplete tetanus
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what effects of stimulation frequency on tension has wave summation where stimulation frequency eliminates relaxation phase and produces peak tension
complete tetanus
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what effects of stimulation frequency on tension seldomly occurs in normal functioning muscles
complete tetanus
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what is a group of muscle fibers called
motor unit
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the size of this varies with muscle control
motor unit
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what motor unit has movements begin with the smallest motor units
recruitment
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what motor unit as movement continues, more and larger motor units are stimulated to contribute producing greater tension
recruitment
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what motor unit is activated on a rotating basis to maintain a sustained contraction
Asynchronous motor unit summation
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what motor unit has variable number of motor units always active to produce low level tension
muscle tone
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what motor unit is regulated at subconscious level
muscle tone
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what motor unit activated muscle fibers use energy and therefore can affect metabolism by a small amount
muscle tone
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