A&P 1 Module 04 Muscle Phys PPT.pptx - Muscle: Microscopic...

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Muscle:Microscopic LevelMuscle TissueSliding Filament TheoryFiber Types / Metabolism
Muscle TissueAnatomy and Physiology I
Objectives11/21/20213Describe the functions of the muscular systemIdentify the special characteristics of muscle cellsCompare and contrast the three types of muscular tissueIdentify the gross anatomy of a muscleIdentify and describe the anatomical parts to the microscopicobservation of skeletal muscle tissueCompare and contrast the thick and thin filament anatomyDescribe the anatomy and function of the neuromuscularjunction
Muscular System: FunctionsMovement of bones and fluids (e.g., blood)Maintaining posture and body positionStabilization jointsHeat generation (especially skeletal muscle)11/21/20214
Muscle Tissue: CharacteristicsExcitability: ability to receive and respond to stimuliContractility: ability to shorten when stimulatedExtensibility: ability to be stretchedElasticity: ability to recoil to resting length11/21/20215
Muscle Tissue:CategoriesSkeletal MuscleAttached to the skeletal systemStriated appearance and under voluntary controlCardiac MuscleFound in the heartStriated appearance and under unconscious/involuntarycontrolSmooth MuscleFound primarily within internal organsNot striated and under unconscious/involuntary control11/21/20216
Muscle Tissue:Categories11/21/20217Skeletal MuscleSmooth MuscleCardiac Muscle
Skeletal Muscle AnatomyTendonFasciaEpimysiumPerimysiumFasciclesEndomysiumMuscle cell (fiber)11/21/20218
11/21/20219
Skeletal Tissue: OverviewMuscle cell and muscle fiber used interchangeableTo understand muscle physiology, vital to understandmuscle anatomyMuscle fibers are long cylindrical shaped cellsHave multiple nucleiMajority of cell filled with myofibrils (protein filaments)11/21/202110
Skeletal Muscle FiberSarcolemmaSarcoplasmicreticulumNucleiMitochondriaT-tubulesMyofibrils11/21/202111
11/21/202112
Skeletal Muscle FiberMyofibrils containspecialized proteinsreferred to asmyofilaments:Thick filamentThin filamentArranged inSACROMERESUnique arrangementto allow for musclecontraction to occur11/21/202113
Skeletal Muscle FiberSarcomereFrom Z line to Z lineArrangement ofthick and thinfilamentsCauses striatedappearanceContractile unit ofmuscle11/21/202114
Sarcomere11/21/202115
Skeletal Muscle Fiber: Thick Filament

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Term
Winter
Professor
abby hanson
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