Skeletal Muscle Tissue
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| a dense layer of collagen fibers, surrounds entire muscle | epimysium
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| a fibrous layer that divides the skeletal muscle into a series of compartments. | perimysium
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| bundle of muscle fibers | muscle fascicle
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| delicate C.T. that surrounds the individual skeletal muscle cells | endomysium
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| stem cells that function in the repair of damaged muscle tissue | myosatellite cells
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| collagen fibers of the C.T. layers merge to to form a bundle | tendon
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| multinucleate cell | myoblast
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| plasma membrane in skeletal muscle fibers | sarcolemms
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| cytoplasm surrounding the myofibrils | sarcoplasm
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| dense region of the sarcomere that contains thick filaments | A bands
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| contains thin filaments but no thick filaments, extends from A band of one sarcomere to the A band of the next | I band
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| repeating functional units | sarcomeres
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| lighter region on either side of the M line | H band
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| connects the central portion of each thick filament | M line
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| mark the boundary between adjacent sarcomeres | Z line
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| proteins that interconnect thin filaments of adjacent sarcomeres | actinins
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| narrow tubes that are continuous with the sarcolema and extend into the sarcoplasm at tight angles to the cell surface | T tubules
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| forms a tubular network around each individual myofibril | sarcoplasmic reticulum SR
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| a graph of tension developing in muscle fibers | myogram
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| begins at stimulation and typically lasts about 2msec. muscle fibers doesnt produce tension | latent period
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| tension rises to a peak | contraction phase
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| calium levels are falling, acitve sites are being covered by tropomyosin, and number of cross-bridges is declining | relaxation phase
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| tension rises like the steps in a staircase | treppe
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| all the muscle fibers controlled by a single motor neuron | motor unit
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| motor units are activated on a rotating basis, some resting and some are active | asynchronous motor unit summation
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| resting tension in a skeletal muscle | muscle tone
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| tension rises and the skeletal muscle's length changes | isotonic contraction
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| load is greater thatn the peak tension the muscle will elongate | eccentric contraction
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| muscle as a whole does not change length, and the tension produced never exceeds the load | iosmetric contraction
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| anaerobic breakdown of glucose to pyruvate in the cytoplasm of the cell | glycolysis
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| normally provides about 95% of the ATP demands of a resting cell | Aerobic metabolism
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| high-energy component muscles store | creatine phosphate CP
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| can no longer perform at the required level of activity | fatigue
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| shuffling lactate to the liver and of glucose back to muscle cells | Cori cycle
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| amount of oxygen required to restore normal, pre-exertion conditions | oxygen debt or excess postexercise oxygen consumption (EPOC)
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| most skeletal fibers in body called..... can reach peak twitch tension in .01 sec | fast fibers
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| only have about half the diameter as fast fibers take three times longer to reach peak tension after stimulation | slow fibers
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| fibers that contain little myoglobin and are relatively pale; resemble fast fibers | intermediate fibers
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| enlargement of the stimulated muscle | hypertrophy
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| reduction of muscle size,tone, and power | atrophy
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| virus attacks motor neurons in the spinal cord and brin, causing muscular atrophy and paralysis (loss of movement) | polio
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| occurs throughout body, beginning with the smaller muscles of the face, neck, and arms. typically begins 2-7 hours after death and disappears after 1-6 days | rigor mortis
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