Between two successive M-lines,there is/are: | vedclass

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(B) The functional unit of muscle contraction is the sarcomere.In a sarcomere,the $A$-band (anisotropic band) is located in the center,containing both

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One complete $A$-band,two half $I$-bands

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(B) The functional unit of muscle contraction is the sarcomere.In a sarcomere,the $A$-band (anisotropic band) is located in the center,containing both actin and myosin filaments.The $M$-line is a thin dark line that runs through the center of the $A$-band.The $I$-band (isotropic band) contains only actin filaments and is bisected by the $Z$-line.When considering the structure between two successive $M$-lines,it spans across two adjacent sarcomeres.Specifically,the region between two $M$-lines consists of one complete $A$-band (from the first sarcomere),two half $I$-bands (one from each side of the $Z$-line),and the $Z$-line itself.However,in the context of standard structural definitions of the sarcomere,the region between two $Z$-lines is one sarcomere. The region between two $M$-lines effectively encompasses one full $A$-band and two half $I$-bands.

Between two successive $M$-lines,there is/are:

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