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During muscular contraction, which of the following events occur?
(I) H-zoned is appears
(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.
  • a)
    (i), (iii), (iv) and (v)
  • b)
    (i), (ii) and (v)
  • c)
    (ii), (iv) and (v)
  • d)
    (i), (ii) and (iii)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
During muscular contraction, which of the following events occur?(I) H...
Muscle contraction is brought about by sliding movement of actin filaments over myosin filaments. When a muscle fibril contracts, ita A band remain constant and I band shortens. H zone also disappears as the actin filaments of both sides in each sarcomere overlap each other at M-line. M-line and Z-line also come closer.
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Community Answer
During muscular contraction, which of the following events occur?(I) H...
During muscular contraction, several events occur. Let's go through each option to determine which events are true.

(i) H-zone disappears:
- The H-zone is a region in the A-band of a sarcomere that contains only thick filaments. During muscle contraction, the H-zone narrows and eventually disappears as the thick and thin filaments overlap.
- This statement is true.

(ii) A-band widens:
- The A-band is the region in a sarcomere that contains both thick and thin filaments. During muscle contraction, the A-band remains the same width because it includes the entire length of the thick filaments, which do not change in length during contraction.
- This statement is false.

(iii) I-band reduces in width:
- The I-band is the region in a sarcomere that contains only thin filaments. During muscle contraction, the I-band narrows as the thin filaments slide inward towards the center of the sarcomere, overlapping with the thick filaments.
- This statement is true.

(iv) Width of A-band is unaffected:
- As mentioned earlier, the A-band contains the entire length of the thick filaments, which do not change in length during muscle contraction. Therefore, the width of the A-band remains the same.
- This statement is true.

(v) M-line and Z-line come closer:
- The M-line is the middle line in a sarcomere that anchors the thick filaments. The Z-line is the boundary between two sarcomeres and anchors the thin filaments.
- During muscle contraction, the M-line and Z-line move closer together as the sarcomere shortens.
- This statement is true.

Based on the above analysis, the correct answer is option A: (i), (iii), (iv), and (v).
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During muscular contraction, which of the following events occur?(I) H-zoned is appears(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.a)(i), (iii), (iv) and (v)b)(i), (ii) and (v)c)(ii), (iv) and (v)d)(i), (ii) and (iii)Correct answer is option 'A'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about During muscular contraction, which of the following events occur?(I) H-zoned is appears(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.a)(i), (iii), (iv) and (v)b)(i), (ii) and (v)c)(ii), (iv) and (v)d)(i), (ii) and (iii)Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During muscular contraction, which of the following events occur?(I) H-zoned is appears(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.a)(i), (iii), (iv) and (v)b)(i), (ii) and (v)c)(ii), (iv) and (v)d)(i), (ii) and (iii)Correct answer is option 'A'. Can you explain this answer?.
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