During muscle contraction in humans,the

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(B) : According to the sliding-filament theory of muscle contraction,actin and myosin filaments slide past each other with the help of cross-bridges t

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$A$ band remains same

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(B) : According to the sliding-filament theory of muscle contraction,actin and myosin filaments slide past each other with the help of cross-bridges to reduce the length of the sarcomeres.The smallest unit of muscle contraction is a sarcomere (which is delineated by $Z$-lines).As a muscle contracts,the $Z$-lines come closer together (shortening the sarcomere),the width of the $I$-bands decreases,and the width of the $H$-zones decreases,but there is no change in the width of the $A$-band.During relaxation,cross-bridges disappear and actin filaments slide back from $A$-bands; the width of the $I$-bands and $H$-zones increases,but there is still no change in the width of the $A$-band.

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