(D) The $M-$line is a thin,dark fibrous protein structure located in the center of the $H-$zone of a sarcomere.It serves to anchor and hold the thick

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(D) The $M-$line is a thin,dark fibrous protein structure located in the center of the $H-$zone of a sarcomere.It serves to anchor and hold the thick myosin filaments in place during muscle contraction.The $H-$zone is the central region of the $A-$band where only thick filaments are present.