During muscle contraction in humans,the:

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(C) According to the Sliding Filament Theory,muscle contraction occurs when thin filaments (actin) slide over thick filaments (myosin).$1$. The length

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Length of $A$ band remains the same

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(C) According to the Sliding Filament Theory,muscle contraction occurs when thin filaments (actin) slide over thick filaments (myosin).$1$. The length of the individual actin and myosin filaments does not change.$2$. The $A$ band,which represents the length of the myosin filaments,remains constant in length.$3$. The $I$ band and the $H$ zone shorten as the actin filaments slide toward the center of the sarcomere.$4$. The sarcomere itself shortens as the $Z$ lines are pulled closer together.Therefore,the length of the $A$ band remains the same during contraction.

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