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Ch. 9 Skeletal Mus.

Skeletal Muscle Tissue

a dense layer of collagen fibers, surrounds entire muscle epimysium
a fibrous layer that divides the skeletal muscle into a series of compartments. perimysium
bundle of muscle fibers muscle fascicle
delicate C.T. that surrounds the individual skeletal muscle cells endomysium
stem cells that function in the repair of damaged muscle tissue myosatellite cells
collagen fibers of the C.T. layers merge to to form a bundle tendon
multinucleate cell myoblast
plasma membrane in skeletal muscle fibers sarcolemms
cytoplasm surrounding the myofibrils sarcoplasm
dense region of the sarcomere that contains thick filaments A bands
contains thin filaments but no thick filaments, extends from A band of one sarcomere to the A band of the next I band
repeating functional units sarcomeres
lighter region on either side of the M line H band
connects the central portion of each thick filament M line
mark the boundary between adjacent sarcomeres Z line
proteins that interconnect thin filaments of adjacent sarcomeres actinins
narrow tubes that are continuous with the sarcolema and extend into the sarcoplasm at tight angles to the cell surface T tubules
forms a tubular network around each individual myofibril sarcoplasmic reticulum SR
a graph of tension developing in muscle fibers myogram
begins at stimulation and typically lasts about 2msec. muscle fibers doesnt produce tension latent period
tension rises to a peak contraction phase
calium levels are falling, acitve sites are being covered by tropomyosin, and number of cross-bridges is declining relaxation phase
tension rises like the steps in a staircase treppe
all the muscle fibers controlled by a single motor neuron motor unit
motor units are activated on a rotating basis, some resting and some are active asynchronous motor unit summation
resting tension in a skeletal muscle muscle tone
tension rises and the skeletal muscle's length changes isotonic contraction
load is greater thatn the peak tension the muscle will elongate eccentric contraction
muscle as a whole does not change length, and the tension produced never exceeds the load iosmetric contraction
anaerobic breakdown of glucose to pyruvate in the cytoplasm of the cell glycolysis
normally provides about 95% of the ATP demands of a resting cell Aerobic metabolism
high-energy component muscles store creatine phosphate CP
can no longer perform at the required level of activity fatigue
shuffling lactate to the liver and of glucose back to muscle cells Cori cycle
amount of oxygen required to restore normal, pre-exertion conditions oxygen debt or excess postexercise oxygen consumption (EPOC)
most skeletal fibers in body called..... can reach peak twitch tension in .01 sec fast fibers
only have about half the diameter as fast fibers take three times longer to reach peak tension after stimulation slow fibers
fibers that contain little myoglobin and are relatively pale; resemble fast fibers intermediate fibers
enlargement of the stimulated muscle hypertrophy
reduction of muscle size,tone, and power atrophy
virus attacks motor neurons in the spinal cord and brin, causing muscular atrophy and paralysis (loss of movement) polio
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
Created by: codemanj13