NEET 2022 Re · Class 11

Locomotion and Movement

According to the sliding filament theory

  1. (A)The actin filaments slide away from A-band resulting in shortening of sarcomere.
  2. (B)Actin and myosin filaments slide over each other to increase the length of the sarcomere.
  3. (C)Length of A-band does not change.
  4. (D)I-band increases in length.

The NCERT line that answers it

Verbatim line

It is clear from the above steps, that during shortening of the muscle, i.e., contraction, the 'I' bands get reduced, whereas the 'A' bands retain the length (Figure 17.5).

Chapter
Locomotion and Movement
Section
17.2.2 Mechanism of Muscle Contraction
Page
5
Words matched
29 of 29

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=0.9473, combined=0.9684). Verified: high — The span explicitly states 'the 'A' bands retain the length' during muscle contraction, which directly and conclusively proves option C is correct.

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Question text is reproduced from the published NEET 2022 Re paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.