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Lecture 8
Muscle Contraction
9
Physiology
Undergraduate 2
02/13/2011
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Term
skeletal muscles
 Definition
-fasted contraction speed
-all or none contraction
Term
motor unit
 Definition
single somatic neuron and group of muscle fibers innervated by it
Term
thin filament
 Definition
actin
Term
thick filament
 Definition
myosin
Term
thick filament
 Definition
myosin
Term
t-tubules
 Definition
carries AP
Term
sarcoplasmic reticulum
 Definition
stores Ca
Term
muscle contraction
 Definition
-AP travels down nerve fiber
-Ach is released
-bind to nicotinic receptors
-depolarizes muscle cell
-AP travels down t-tubules
-ryanodine receptor
-Ca release
-activates troponin
-moves tryptomyosin
-mysoin binds to actin
Term
release of P
 Definition
initiates power stroke
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