The contractile unit of a muscle fiber is kno | vedclass

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(B) The functional and contractile unit of a striated muscle fiber is called a $Sarcomere$. It is the segment of a myofibril located between two succe

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Sarcomere

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(B) The functional and contractile unit of a striated muscle fiber is called a $Sarcomere$. It is the segment of a myofibril located between two successive $Z$-lines (or $Z$-discs). It contains the arrangement of actin (thin) and myosin (thick) filaments that slide past each other during muscle contraction,as explained by the Sliding Filament Theory.

The contractile unit of a muscle fiber is known as:

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