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14
Sliding Filament Theory of Contractions
Length of and do not change, only the bands/zone change size
and bands get smaller
get larger
lines move closer together
Width of band remains constant
Length of and do not change, only the bands/zone change size
and bands get smaller
get larger
lines move closer together
Width of band remains constant
Length of actin and myosin do not change, only the bands/zone change size
H and I bands get smaller
Zones of Overlap get larger
Z lines move closer together
Width of A band remains constant
Thin filaments slide toward center of each sarcomere, alongside thick filaments
Sliding occurs in every sarcomere along myofibril: myofibril gets shorter
Myofibril attached to sarcolemma at each Z line and at either end of muscle fiber, thus when myofibril gets shorter so does the entire muscle fiber
H and I bands get smaller
Zones of Overlap get larger
Z lines move closer together
Width of A band remains constant
Thin filaments slide toward center of each sarcomere, alongside thick filaments
Sliding occurs in every sarcomere along myofibril: myofibril gets shorter
Myofibril attached to sarcolemma at each Z line and at either end of muscle fiber, thus when myofibril gets shorter so does the entire muscle fiber
