(D) sarcomere is defined as the structural and functional unit of a muscle fiber,which is the segment of a myofibril located between two successive $Z

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One $A$-band and two half $I$-bands

(D) sarcomere is defined as the structural and functional unit of a muscle fiber,which is the segment of a myofibril located between two successive $Z$-lines.It consists of one complete $A$-band in the center and two halves of $I$-bands on either side of the $A$-band,each adjacent to a $Z$-line.