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Dark bands on the myofibril form A-band. Middle part of A-band contains light zones-Hensen line (H-lines). Light band on myofibril is called I-band. Middle part of I-band contains Z-lines. Sarcomere is part between two Z-lines.

1. Dark bands on the myofibril form A-band.
2. Middle part of A-band contains light zones-Hensen line (H-lines).
3. Light band on myofibril is called I-band.
4. Middle part of I-band contains Z-lines.

Correct answer: Middle part of I-band contains Z-lines.

Solution

The I-band is the light band of a myofibril, and its center contains the Z-line. The A-band is dark, and its middle region contains the H-zone, so the statement about the I-band is the correct one.

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