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Sarcomere

During muscle...

Question

During muscle contraction

A

the A band remains the same and the I band narrows.

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B

the I band remains the same and the A band narrows.

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C

both the A band and I band remain the same.

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D

both the A band and I band narrow.

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Solution

The correct option is A
the A band remains the same and the I band narrows.

Upon muscle contraction, the A-bands do not change their length, whereas the I-bands and the H-zone shorten. This causes the Z lines to come closer together.

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Similar questions

Q. During muscle contraction, which of the following shortens?
(i) A band
(ii) I band
(iii) Sarcomere

Q. Differentiate between A-band and I-band.

Q. Pick out the number of correct statements regarding muscle contraction-
i) length of

a

band remains
ii) length of

i

band decreases
iii)

Z

line are pulled to centre
iv)

M

line are remaining same

Q. Very short answer type.
Name the protein found in A-band and I-band of a myofibril.

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.

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