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19 Cards in this Set

  • Front
  • Back
what are the 2 categories of muscle contraction
Isotonic
Isometric
contraction whereby muscles are in tension just slightly greater than the load and maintains such tension
Isotonic contraction
muscle tension increases by does NOT exceed load and thus no motion
Isometric contraction
in what form of muscle contraction does the muscle shorten and tension is constant?
Isotonic
in what form of muscle contraction does the muscle remain the same length and tension increases
Isometric
how many motor neurons synapse on each muscle cell?
1
what are the 2 causes of delay before muscle contraction?
- Calcium travelling and binding to Troponin

- series elastic element of tendons and extracellulary matrix
what type of muscle contraction requires a longer delay before peak peak contraction response?
Isotonic
The speed (velocity) of shortening muscle is a function of ____
myosin ATPase activity
Likely, what type of muscle are the anti-gravity muscles of the back?
slow-twitch ( red)
What is the source of ATP for fast twitch muscles?
Glycolysis
What muscle types utilize Oxidative Phosphorylation as an ATP source for conctraction at the myosin head level?
Intermediate twitch
Slow twitch
what muscle types have the highest stores of glycogen?
fast twitch
LIst the fiber size of muscle types in decreasing order?
Fast twitch > Int. > Slow twitch
Which muscle types are seen as red in color?
Intermediate and Slow - twitch
the duration of muscle contraction for single twitch muscles by the rate of?
return of Ca++ into the SR
the strength of contraction is a fxn of ____ _____
crossbridges in parallel
recurrent stimulation of the alpha motor neuron results in multiple muscle APs and fusion of Ca++ pulses
summation
asynchronous activation by additional alpha motor neurons to increase the the contraction of muscle fibers being innervated
recruitment