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| red pigment that stores oxygen, located in sarcoplasm, similar to hemoglobin, |
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| plasma membrane of muscle fibers, supplies with blood |
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| elaborate smooth endoplasmic reticulum; interconnecting tubueles surround each myofibril |
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| smallest contractile unit of a muscle fiber; functional unit of skeletal muscle |
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| groups of muscle fibers surrounded by perimysium |
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| accounts for 80% of cellular volume; contains contractile elements of skeletal muscle cells (sarcomeres) |
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| overcoat of dense irregular connective tissue that surrounds whole muscle |
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| layer of fibrous connective tissue that surrounds each fascicle |
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| whispy sheath of connective tissue that surrounds each individual muscle fiber |
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| attach and cover the bony skeleton; skeletal, striated, voluntary |
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| found in walls of hollow visceral organs (ex: stomach), forces fluids and other things through internal body channels; visceral, nonstriated, involuntary |
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| only in heart; cardiac, striated, involuntary |
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| neurotransmitter in muscle contraction |
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| enzyme located in synaptic cleft |
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| unique high-energy molecule stored in muscles, tapped to regerate ATP |
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| used in excitation-contraction coupling; secreted by sarcolemma; enters muscle fibers and forces release of acetylcholine in NMJ |
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| leaves muscle fiber as Na+ enters to produce local channge in membrane potentional (depolarization), in NMJ and AP |
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| enters muscle fiber as K+ leaves and makes interior of sarcolemma less (-), in NMJ and AP |
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| smooth, sustained muscle contraction resulting from high-frequency stimulation |
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| response of a motor unit to single action potential of motor neuron; muscle fibers contract quickly then relax |
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| relaxed muscles are almost always slightly contracted; due to spinal reflexes; does not produce active movements; keeps muscles firm and ready to respond to stimulation |
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| muscle length changes and moves load |
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| muscle length changes and moves load; isotonic and isometric |
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| moves load; muscle length changes |
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| doesn't move load, muscle tension reaches peak |
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-initiated by reentry of Ca2+ into SR
-muscle force declines=muscle tension decreases to zero -tracing returns to baseline
-muscle returns to original length
-muscle contracts faster than relaxes |
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first few milliseconds following stimulation when E-C coupling occurs;
muscle tension beginning to increase but no response seen on myogram |
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