In striated muscle contraction:

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(B) During muscle contraction,the sliding filament theory explains that actin filaments slide over myosin filaments towards the center of the sarcomer

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$H$-band is obliterated

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(B) During muscle contraction,the sliding filament theory explains that actin filaments slide over myosin filaments towards the center of the sarcomere.As the actin filaments move inward,they overlap more with the myosin filaments.This process causes the $H$-zone (the central region of the $A$-band containing only myosin) to narrow and eventually disappear or become obliterated when the muscle is fully contracted.The length of the $A$-band remains constant,and the $Z$-lines move closer to each other.

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