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18 Cards in this Set
- Front
- Back
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Muscle fiber
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long, cyndrical cell w/ many nuclei
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sarcolemma
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plasma membrane in a muscle fiber. Form a set of T-tubules (transverse tubules)
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Sarcoplasm
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cytoplasm of a muscle fiber.
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Myofibrils
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2 types of myofilaments
-myosin -actin |
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Myosin filaments
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thick, consist of protein myosin
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Actin filaments
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protein actin. contain Tropomyosin and troponin complex that regulate actin.
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Sarcomeres
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repeating units of actin and myosin. Hundreds of sarcomere make up a myofibril
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Z line
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join sarcomeres. interweaving filaments.
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Striations
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contraction characteristic
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sliding filament model
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theory of muscle contraction.
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"wave of depolarization"
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action potential. nerve impulse. cholinesterase removes acetylcholine.
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motor unit
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motor neuron is connected to 150 muscle fibers.
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neuromuscular junction
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junction of a motor neuron w/ a muscle fiber
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action potential
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-depolarization travels along sarcolemma into T-tubule membranes.
-Opens calcium channels in sarcoplasmic reticulum releasing CA into myofibrils. -ca binds to troponin complex on actin. Troponin pushes tropomyosin away from actin sites. -one end of each myosin molecule is folded into 2 heads. -ATP is bound to myosin. myosin converts chemical energy of ATP into mechanical energy of sliding filaments. -myosin head cross bridges w/ actin |
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muscle tone
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partial contraction. process for readiness.
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Rigor mortis
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muscular rigidity after death results from ATP depletion
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Creatine phosphate
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energy storage compund. enrgy is transferred to ATP as needed.
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glycogen
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polysaccharide formed from glucose molecules.
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