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During muscle contraction, A - band/I-ba...

During muscle contraction, A - band/I-band remains unchanged.

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**Step-by-Step Solution:** 1. **Understanding Muscle Structure**: - Muscles are made up of myofibrils, which contain two types of filaments: thick filaments (myosin) and thin filaments (actin). - The arrangement of these filaments creates bands in the muscle fibers known as the A band and I band. 2. **Identifying A Band and I Band**: - The A band is the darker band that contains the thick filaments (myosin) and some overlapping thin filaments (actin). ...
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