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Muscle PhysiologyMuscle PhysiologyMuscle Physiology
Muscle FiberStructure
Muscle FiberMuscle FiberStructureStructure
Release of Ca++
from SarcoplasmicReticulum
Release of CaRelease of Ca++++
from from SarcoplasmicSarcoplasmicReticulumReticulum
MyofibrilMyofibrilMyofibril
Muscle Contraction
Muscle Muscle ContractionContraction
Z membrane(end of sarcomere)
Cross-bridgeBinding Site(need Ca2+)
Thick Filament (myosin)
Thin Filament (actin)
Sliding-Filament Model of Muscle
Contraction
SlidingSliding--Filament Filament Model of Muscle Model of Muscle
ContractionContraction
Muscle SpindleMuscle SpindleMuscle Spindle
Myotatic ReflexMyotaticMyotatic ReflexReflex
Knee-Jerk Reflex
KneeKnee--Jerk Jerk ReflexReflex
Alpha and Gamma Motor
Neurons
Alpha and Alpha and Gamma Motor Gamma Motor
NeuronsNeurons
Gamma Motor Neuron FunctionGamma Motor Gamma Motor
Neuron FunctionNeuron Function
Golgi Tendon Organ
GolgiGolgi Tendon Tendon OrganOrgan
Organization of Muscle ProprioceptorsOrganization of Muscle Organization of Muscle ProprioceptorsProprioceptors
Circuitry of the Reverse Myotatic ReflexCircuitry of the Reverse Circuitry of the Reverse MyotaticMyotatic ReflexReflex
Reciprocal Inhibition of Extensors and FlexorsReciprocal Inhibition of Extensors and FlexorsReciprocal Inhibition of Extensors and Flexors
Circuitry of the Polysynaptic Flexor Reflex
Circuitry of the Circuitry of the Polysynaptic Polysynaptic Flexor ReflexFlexor Reflex
Circuitry of the Crossed-Extensor
Reflex
Circuitry of the Circuitry of the CrossedCrossed--Extensor Extensor
ReflexReflex
Review of AnatomyReview of AnatomyReview of Anatomy
Whole MuscleWhole Muscle
Muscle fiber (cell)Muscle fiber (cell)
MyofibrilMyofibril
SarcomereSarcomere
MyofilamentsMyofilamentsMyosin Myosin
Actin Actin
CrossCross--bridging & bridging & ““ratchetingratcheting””
Twitch Rate Slow FastGlycogen Content Low HighGlycolytic Capacity Low HighFatigue Resistance High LowRespiration Type Aerobic AnaerobicCapillary Supply High Low
Slow- & Fast-Twitch MusclesSlowSlow-- & Fast& Fast--Twitch MusclesTwitch Muscles
Slow-twitch found more in muscles (like postural muscles)that must sustain contractions for long times without fatigue.Depend relatively more on fats for energy.
Atrophied FiberControl Fiber
Force (% of Peak Force)
Pow
er (u
n x
ft/s
)