According to the sliding filament theory:

According to the sliding filament theory:
  1. Actin and myosin filaments slide over each other to increase the length of the sarcomere.
  2. Length of A-band does not change.
  3. I-band increases in length
  4. The actin filaments slide away from A-band resulting in shortening of sarcomere.

Solution

According to Sliding filament theory, thin. Filament slide over Thick filament (mainly myosin). That is why the length of $\mathrm{A}$ band does not change as A band is made up of thick filament.

Asked in: NEET 2022 (Phase 2)

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