muscular system intro A&P

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35 Terms

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muscle types differ

  1. location

  2. cell structure

  3. control

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muscular system similar

  1. elongated

  2. contraction

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elongated muscles=

  1. muscle fibers

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contraction in muscle

  1. myofilaments

  2. actin

  3. myosin

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skeletal muscle tissue

  1. striated

  2. multinucleated

  3. voluntary control

  4. contracts quickly= tire easily

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fibers skeletal muscle tissue

  1. soft and fragile

  2. three layers of connective tissue

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endomysion

  1. surrounds each single muscle fiber

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perimysium

  1. surrounds bundles of muscle fibers (fascicles)

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epimysium

  1. surrounds the entire muscle

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function of muscles

  1. produce movement

  2. maintain posture

  3. stabilize joints

  4. generate heat

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microscope anatomy of muscles

  1. multinucleated

  2. sarcolemma

  3. mitofibrils

  4. sarcoplasmic reticulum

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sarolemma=

  1. plasma membrane

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mitofibrils

  1. rods

  2. made up of sarcomeres

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sarcomeres

  1. basic unit of contraction

  2. myofilaments

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thick myofilaments

  1. myocin

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thin myofilaments

  1. Actin

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Sercoplasmic Reticulum

  1. modified smooth ER

  2. stores calcium→ released= muscle contraction

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motor unit def=

  1. one motor unit-plus muscle fibers

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Nero muscular junction

  1. gap= synaptic cleft

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step 1 in nero muscular junction

  1. impulse down neuron

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step 2 in nero muscular junction

  1. vesicles of nuerotransmitters = (exocytosis) release into gap

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step 3 nero muscular junction

  1. diffusion of neurotrasmitters’s to reception

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step 4 nero muscular junction

  1. sercoplasmic reticulum releases calcium= muscle contraction

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sliding filament model

  1. sarcomere

  2. myosin

  3. actin

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step 1 to sliding filament model

  1. blocking actin- removed by calcium→myocin ‘grabs’ the actin

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step 2 to sliding filament model

  1. myosin head pivots and pulls the actin

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step 3 sliding filament model

  1. ATP→ head releases and recharges

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stored ATP source in muscle activity

  1. 1. 4-6 seconds of movement

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creatine phosphate

  1. transfer energy ATP= 20 second

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Aerobic respiration→ glucose

  1. require oxygen

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anaerobic respiration

  1. no oxygen

  2. 60 seconds

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isotonic contraction

  1. mass moves

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isometric contraction

  1. muscle tone

  2. no movement

  3. atrophy

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origin

  1. immoveable end

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insertion=

  1. move towards the origin