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The Cross Bridge Cycle

All of the fo...

Question

All of the following changes occur during contraction of a muscle fibre except

A

Width of A-band and I-band remain the same.

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B

Actin filaments slide over myosin filaments.

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C

Length of actin and myosin filaments remain the same.

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D

Width of H-zone decreases

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Solution

The correct option is A Width of A-band and I-band remain the same.
Width of I-band decreases during muscle contraction.

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Similar questions

Q. Choose the option having all the correct statements:
I. Thin and thick filaments consist of myosin and actin, respectively.
II. The H-zone and I-band consists of only myosin and actin, respectively.
III. A-band contains both actin and myosin.
IV. M-line and Z-line are in the middle of thin and thick filaments, respectively.

Q. One myosin filament in the myofibril of skeletal muscle fibre is surrounded by how many actin filaments?

Q. Assess the statements.
1. A-bands of the muscle is dark and contain myosin.
2. I-bands are the light bands and contain actin.
3. During muscle contraction the A-band contracts.
4. The part between the two Z-lines is called as sarcomere.
5. The central part of thick filament, not overlapped by thin filament, called H-zone.
Of the above statements.

Q. One myosin filament in the myofibril of skeleton muscle fibres is surrounded by how many actin filaments.

Q. Value based questions.
Explain how any change in the A, H and I band lengths are brought about in terms of what happens to the actin and myosin filaments.

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