E
Rather, it is the length of the sarcomere that shortens during muscle contraction.
Explanation:
The actin and myosin filaments do not shorten during a contraction. Rather the distance between the Z-lines that delimit a sarcomere shortens. It shortens because the actin and myosin fibers move antiparallel to each other hence pulling on the respective Z lines, on either side, on which they are attached.
The antiparallel movement is brought about by the ‘rowing’-like action of the myosin heads on the actin filament as they bind and release their binding sites on the actin
Learn More:
For more on actin and myosin check out;
https://brainly.com/question/13645284
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