The smallest contractile unit within skeletal muscle would correspond to the distance between which two points in the figure?

The smallest contractile unit within skeletal muscle is the sarcomere, which corresponds to the distance between two Z-discs (or Z-lines) in the figure. The sarcomere is the segment that contains the actin and myosin filaments responsible for muscle contraction. Each sarcomere shortens during contraction, leading to overall muscle shortening.