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19 Cards in this Set
- Front
- Back
what are the 2 categories of muscle contraction
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Isotonic
Isometric |
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contraction whereby muscles are in tension just slightly greater than the load and maintains such tension
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Isotonic contraction
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muscle tension increases by does NOT exceed load and thus no motion
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Isometric contraction
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in what form of muscle contraction does the muscle shorten and tension is constant?
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Isotonic
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in what form of muscle contraction does the muscle remain the same length and tension increases
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Isometric
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how many motor neurons synapse on each muscle cell?
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1
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what are the 2 causes of delay before muscle contraction?
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- Calcium travelling and binding to Troponin
- series elastic element of tendons and extracellulary matrix |
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what type of muscle contraction requires a longer delay before peak peak contraction response?
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Isotonic
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The speed (velocity) of shortening muscle is a function of ____
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myosin ATPase activity
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Likely, what type of muscle are the anti-gravity muscles of the back?
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slow-twitch ( red)
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What is the source of ATP for fast twitch muscles?
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Glycolysis
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What muscle types utilize Oxidative Phosphorylation as an ATP source for conctraction at the myosin head level?
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Intermediate twitch
Slow twitch |
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what muscle types have the highest stores of glycogen?
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fast twitch
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LIst the fiber size of muscle types in decreasing order?
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Fast twitch > Int. > Slow twitch
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Which muscle types are seen as red in color?
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Intermediate and Slow - twitch
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the duration of muscle contraction for single twitch muscles by the rate of?
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return of Ca++ into the SR
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the strength of contraction is a fxn of ____ _____
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crossbridges in parallel
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recurrent stimulation of the alpha motor neuron results in multiple muscle APs and fusion of Ca++ pulses
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summation
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asynchronous activation by additional alpha motor neurons to increase the the contraction of muscle fibers being innervated
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recruitment
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