During contraction of skeletal muscle fibers, the
a. contractile proteins contract.
b. thin filaments slide inward toward the A band's center as a result of cycles of cross-bridge binding and bending.
c. thick and thin filaments become tightly coiled, thus shortening the sarcomere.
d. I bands slide in between the A bands.
e. lateral sacs of the sarcoplasmic reticulum shrink, pulling the Z lines closer together.
B
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