**Step-by-Step Solution:**
1. **Definition of A-band and I-band:**
- The A-band is a dark band in muscle fibers that contains thick filaments (myosin) and is wider than the I-band.
- The I-band is a light band that contains thin filaments (actin) and is located on either side of the A-band.
2. **Composition:**
- The A-band is composed of both thick (myosin) and thin (actin) filaments, which contribute to its darker appearance.
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Knowledge Check
The energy band gap (difference between conductor band and valance band) in semiconductors is
A
0 eV
B
1 eV
C
5 eV
D
none of these
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