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26 Cards in this Set
- Front
- Back
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Contraction produces ______, force exerted on load or object to be moved.
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Muscle Tension
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___________, no shortening, muscle tension increases but does not exceed load.
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Isometric Contraction
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__________, Muscle shortens because muscle tension exceeds load.
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Isotonic Contraction
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Each muscle is connected to at least one _____(______)
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Motor Nerve (Nerve Fiber)
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A _____ is a motor neuron and all (hundreds) of muscle fibers it controls.
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Motor Unit
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Motor units in muscles usually contract _______ to prevent muscle fatigue.
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Asynchonously (Not at the same time)
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A ________ is a motor units response to single action potential of it's motor neuron.
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Muscle Twitch
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The three phases of muscle twitch are _______.
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Latent Period
Period of Contraction Period of Relaxation |
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_____________, sarcomere shortens from cross bridge formation, there is visible tension (external tension).
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Period of Contraction
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_______, Ca 2+ re-enters into the SR, tension declines to zero.
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Period of Relaxation
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______________,events of excitation-contraction coupling. No visible shortening of muscle.
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Latent Period
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_______, are required for proper control of skeletal movement
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Graded muscle responses
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Responses are graded by:
1.Changing ______ of stimulation 2. Changing _______ of stimulation. |
Frequency, Strength
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__________ Produce twitches
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Threshold Strimuli
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Twitches can very in strength depending on:
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Ca 2+, Concentration, Previous Stretch of the Muscle, Temperature, Ph and Hydration
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________ In Muscle cell occurs much faster than actual contraction
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Action Potential
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Low Frequency (up to ____ per second)
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10 Stimulus
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Moderate Frequency (Between ____________________ per second)
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10-20 Stimulus
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Increase in SR Ca 2+ Concentration = More Cross Bridge Formation = ______________________
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Increase in tension produced
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If the second contraction is of greater force, then there is an additional __________.
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Ca 2+ Release
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If there is an Further increase in stimulus frequency, the result will be an _______.
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Unfused (Incomplete tetanus)
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If stimuli are given quickly enough, muscle reaches maximal tension and the result is _______.
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Fused Tetanus
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Why is tetanic tension so much greater than twitch tension?
Isometric Tension produced by ______, at any moment depends mainly on __________. |
Total number of cross bridges undergoing power stroke.
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A single action potention in a skeletal muscle fiber briefly releases enough ____________, to saturate ______________ making all of the shin filaments initially available.
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Calcium, Troponin
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What happens during the time in between the binding of energized myosin head to myosin binding sites?
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The Calcium released by the SR gets pumped back into te SR by the SERCA pumps.
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During Tetanus contraction, the succesive _____ Each release _____ from the SR before all of the Ca from the previous AP can be pumped into the SR.
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Action Potentials, Calcium
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