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Skeletal Muscle

By garces8, Aug 2009

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epimysium	1. surrounds the muscle 2. is continuous with the tendons at either end of the muscle
perimysium	surrounds bundles of ms fibers "fasciculi"
endomysium	1. surrounds individual ms fibers 2. is encircled by the sarcolemma (ms fiber membrane)
sarcolemma	plasma membrane surrounding the ms fiber, fuses with the ms tendon
sarcoplasm	1. ms cytoplasm 2. surrounds myofibrils 3. contains proteins, glycogen, fats, myoglobin, n cellular organelles
transverse tubules	1. allows for neural transmission and passage of extracellular fluids into ms fiber 2. runs perpendicular to ms fiber
sarcoplasmic reticulum	1. network of tubules running parallel to the myofibrils 2. storage site for Ca+
myofibril contains?	contractile proteins actin n myosin
sarcomere	1. smallest contractile unit of skeletal ms 2. basic funtional unit of the myofibril 3. extend from z- line to z-line
myosin filament	1. thick filaments 2. comprise 2/3 f/all skeletal ms protein 3. globular head form cross bridges w/actin
myosin head contains?	binding site for ATP
myosin is stabilized by?	titin filaments
actin filament	1. thin filament 2. has an active site which can bind with myosin 3. contain proteins tropomyosin and troponin
What does the A band consist of and what happens to it during contraction?	1. myosin and actin filaments 2. no change
What does the I band consist of and what happens to it during contraction?	1. actin filaments that extend inward 2. gets smaller during contraction
what happens to the H zone during contraction?	gets smaller