NEET Zoology Sliding Filament Theory MCQ Question
During muscular contraction, which of the following events occur?
(i) H⁻zone disappears
(ii) A⁻band widens
(iii) I⁻band reduces in width
(iv) Width of A⁻band is unaffected
(v) M⁻line and Z⁻line come closer
(i), (iii), (iv) and (v)
(i), (ii) and (v)
(ii), (iv) and (v)
(i), (ii) and (iii)
Correct Answer
Detailed Explanation
During muscle contraction, the H⁻zone disappears, the I⁻band reduces in width, and the A⁻band remains unaffected. The M⁻line and Z⁻line come closer as the sarcomere shortens.
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