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Cards In This Set
| Front | Back |
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How do muscles relax?
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Acheiveed by transportiong ca2+ back into the sacroplasmic reticulum
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Muscle relaxation requires energy but not as much as?
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Muscle contraction
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In muscle relaxation when ca2+ is not present the binding sitess for myosin are not?
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Exposed
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What is a muscle twitch?
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A muscle twitch is the contraction of a muscle in response to a stimulus
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What are the three phases of a muscle twitch?
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-Lag (latent) phase
-contraction phase
-relaxation pahse
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Muscle contraction is linked to?
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Stimulus strength
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If there does not meet threshold(subthreshold) stimulus strenth then no action pontential which results in?
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No muscle contraction
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If threshold is reached then there is action pontential which result in ?
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Muscle contraction
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Once action potential is produced the skeletal muscle will contract to produce a ?
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Constant force (tension)
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Single motor neuron + muscle fibers that innervates =
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Motor unit
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Motor units respond in what type of fashion?
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All or none
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Whole muscle respond differently than motor units beccause they respond in a?
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Graded fashion
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The strength of muscle contractions varies between weak and strong depending on?
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Stimulus strength
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Whole muscles are composed of many?
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Motor units
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A whole muscle will contract with either small or large force depending on the ?
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Number of motor units that are stimulated
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