NEET 2001 · Class 11

Locomotion and Movement

Which statement is correct for muscle contraction?

  1. (A)Length of H-zone decreases
  2. (B)Length of A-band remains constant
  3. (C)Length of I-band increases
  4. (D)Length of two Z-line increases

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=0.9611, combined=0.9766). Verified: high — The span explicitly states 'the 'A' bands retain the length' during muscle contraction, which directly and conclusively proves that the length of the A-band remains constant.

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