UNIT 6 – Muscular system



Functions of Skeletal MuscleMovement - Tone and Posture - Protection - Control Openings - Maintain Temperature - Anatomy of a MuscleEpimysium –Fascicle –Perimysium –Muscle Fibers – Endomysium –Tendon –Aponeurosis –42225113805900Muscle FibersMultinucleate –Amitotic –Sarcolemma – Sarcoplasmic Reticulum –Myofibrils – Actin – Myosin – Muscle Fiber Contraction Motor Neuron – T-Tubules – Sarcoplasmic Reticulum – Myosin / Actin Interaction - Muscle Belly - Factors influencing contraction strength/endurance32575505905500Muscle Fiber SummationSummation –Twitch –Stimulus –Latent Period –Contraction Phase –Relaxation Phase –Tetanus - Energy In MusclesATPPhosphate GlycolysisAnaerobicLocationCell respirationAerobic LocationFermentation Lactic acid Glycogen Causes of fatigue“Hitting the Wall”“Out of Breath”Muscle Fibers and ConditioningFast-Twitch FibersSizeDensityGlycogen availabilityMitochondriaPros/ConsSlow-Twitch FibersSizeBlood supplyMyoglobinMitochondriaPros/ConsAerobic ExerciseAnaerobic ExerciseAnabolic SteroidsSide EffectsMuscular System DisordersPolioALS / Lou Gehrig’s DiseaseMuscular DystrophyMuscle NamingDirectionSizeLocationNumber of originsLocation of origin / insertionShapeAction3659505254000Head and Neck MusclesFrontalis MasseterTemporalisBuccinatorOrbicularis oculiOrbicularis orisZygomaticus Sternocleidomastoid40290759080500Anterior Trunk MusclesPectoralis MajorRectus abdominisExternal obliqueInternal obliqueTransversus abdominis46291501714500Posterior Trunk MusclesTrapeziusLatissimus dorsiDeltoid495681010223500Arm MusclesBiceps Brachii –Brachioradialis –Triceps Brachii –Extensor capri ulnaris –Extensor carpi radialis –Extensor digitorum50054506826700Posterior Leg MusclesGluteus maximusGluteus mediusBiceps femorisSemitendinosusSemimembranosusGastrocnemiusSoleus521970011049000 Anterior Leg MusclesSartoriusRectus femorisVastus medialisVastus lateralisVastus intermedialisTibialis anteriorFibularis Anterior MusclesPosterior Muscles ................
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