Muscle Physio

《Muscle Physio》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、MusclePhysiologyHumanAnatomyandPhysiologyIIOklahomaCityCommunityCollegeDennisAndersonMuscleTissueSkeletalMuscleCardiacMuscleSmoothMuscleSkeletalMuscleLongcylindricalcellsManynucleipercellStriatedVoluntaryRapidcontractionsCardiacMuscleBranchingcellsOneortwonucleip

2、ercellStriatedInvoluntaryMediumspeedcontractionsSmoothMuscleFusiformcellsOnenucleuspercellNonstriatedInvoluntarySlow,wave-likecontractionsMicroanatomyofSkeletalMuscleZlineZlineHBandSarcomereRelaxedSarcomerePartiallyContractedSarcomereCompletelyContractedBindingSi

3、teTropomyosinTroponinMyosinNeuromuscularJunctionAcetylcholineOpensNa+ChannelMuscleContractionSummaryNerveimpulsereachesmyoneuraljunctionAcetylcholineisreleasedfrommotorneuronAchbindswithreceptorsinthemusclemembranetoallowsodiumtoenterSodiuminfluxwillgenerateanact

4、ionpotentialinthesarcolemmaMuscleContractionContinuedActionpotentialtravelsdownTtubuleSarcoplamicreticulumreleasescalciumCalciumbindswithtroponintomovethetroponin,tropomyosincomplexBindingsitesintheactinfilamentareexposedMuscleContractionContinuedMyosinheadattach

5、tobindingsitesandcreateapowerstrokeATPdetachesmyosinheadsandenergizesthemforanothercontactionWhenactionpotentialsceasethemusclestopcontractingMotorUnitAllthemusclecellscontrolledbyonenervecellMotorUnitRatiosBackmuscles1:100Fingermuscles1:10Eyemuscles1:1ATPCreatin

6、eMoleculecapableofstoringATPenergyCreatine+ATPCreatinephosphate+ADPCreatinePhosphateMoleculewithstoredATPenergyCreatine+ATPCreatinephosphate+ADPMuscleFatiqueLackofoxygencausesATPdeficitLacticacidbuildsupfromanaerobicrespirationMuscleAtrophyWeakeningandshrinkingof

7、amuscleMaybecausedImmobilizationLossofneuralstimulationMuscleHypertrophyEnlargementofamuscleMorecapillariesMoremitochondriaCausedbyStrenuousexerciseSteroidhormonesSteroidHormonesStimulatemusclegrowthandhypertrophyMuscleTonusTightnessofamuscleSomefibersalwayscontr

8、actedTetanySustainedcontractionofamuscleResultofarapidsuccessionofnerveimpulsesTetanusRefractoryPeriodBriefperiodoftimeinwhichmusclecellswillnotrespondtoastimu