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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: Dark bands on the myofibril form A-band.

Solution

A-bands are indeed the dark bands on myofibrils, while I-bands are the light bands.

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