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skeletal muscle structure, sliding filament theory, cross-bridge cycling

perimysium

connective tissue surrounding a fascicle

epimysium

connective tissue ensheathing the entire muscle

sarcomere

contractile unit of muscle

fiber

a muscle cell

endomysium

thin connective tissue investing each muscle cell

sarcolemma

plasma membrane of the muscle cell

myofibril

a long, filamentous organelle found within muscle cells that has a banded appearance

myofilament

actin- or myosin-containing structure

tendon

cord-like extension of connective tissue beyond the muscle, serving to attach it to the bone

fascicle

a discrete bundle of muscle cells

sarcoplasm

cytoplasm within a muscle fiber

fascia

sheet of fibrous connective tissue that encloses a muscle

aponeurosis

sheet of connective tissue by which certain muscles are attached to bone and fascia

myosin

thick filaments

actin

thin filaments

troponin/tropomyosin

two proteins associated with actin

sliding filament theory

when sarcomeres shorten, thick and thin filaments slide past each other, with think filaments moving toward the center of the sarcomere from both ends. H zones and I bands narrow, regions of overlap widen, and Z lines move closer together, shortening the sarcomere.

cross-bridge cycling

see book, pg. 294

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