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Muscle (Fascicles (Muscle Fibers (Cells) (Myofibrils (Thick and Thin…
Muscle
Fascicles
Muscle Fibers (Cells)
Myofibrils
Thick and Thin Filaments
smallest
endomysium (around fibers or cells)
perimysium (around fascicles)
Epimysium (around muscle)
Largest
Sliding Filament Theory
A muscle fiber shortens by movement of the insertion towards the origin of the muscle
Myofibrils shorten because sarcomeres are shortening
Myofliaments slide
Power strokes pull
actin
over
myosin
Adjacent A bands are pulled closer together
H bands shorten during contraction as the
thin filaments on sides of sarcomeres are pulled to the middle
I bands between shorten
distance between Z discs is reduced