when sarcomeres shorten, thick and thin filaments slide past one another
- H zones and I bands narrow
- Z lines move closer together
-thin and thick filaments do not change length
-overlap between filaments increases
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Sliding filament model
,inability to contract muscles
-decreased blood flow
-ion imbalances across sarcolemma
-loss of desire to continue exercise
-accumulations of lactic acid
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Muscle fatigue
requires interaction from several chemical and cellular components
-results from a movement within myofibrils, actin and myosin filaments slide past each
other, shortening sarcomeres
-Muscle fibers shortens and pulls on attachment points
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Skeletal muscle contraction
Center of sarcomere and A band
-anchors thick filaments
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M line
Cord like mass of connective tissue that connects muscle to bone
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Tendon
-composed of myosin protein
-heads form cross bridges with thin filaments
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Thick filaments
-intermediate twitch fibers
-intermediate oxidative capacity
-intermediate amount of myoglobin
-white fibers
-resistant to fatigue
-Rapid ATPase activity
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Fast twitch Glycolyticl fibers Type 2a
Calcium ions are stored in SR
-troponin - tropomyosin complexes cover binding sites on actin filaments
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