Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-diagram based-Medium-Class 11
Consider a diagram showing a segment of a myofibril with labels for the 'Z' line, 'M' line, and the central region of the 'I' band. Which of the following correctly describes the function of the 'M' line?
A
It holds the thick filaments together in the 'A' band.
B
It is the point of attachment for thin filaments.
C
It is the boundary of a sarcomere.
D
It bisects the 'I' band and holds elastic fibers.
Correct Answer
Option A
Detailed Explanation
The 'M' line is a thin fibrous membrane that holds the thick filaments together in the middle of the 'A' band. This is consistent with the arrangement of sarcomeres as described in the NCERT context.
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