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Locomotion and Movement

Which stateme...

Question

Which statement about the structure of skeletal muscle is true ?

A

The sarcoplasm of the muscle cell is contained within the sarcoplasmic reticulum.

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B

When a muscle contracts, the A bands of the sarcomere lengthen.

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C

When a muscle contracts, the H bands of the sarcomere shorten.

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D

The light bands of the sarcomere are the regions where actin and myosin filaments overlap

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Solution

The correct option is C
When a muscle contracts, the H bands of the sarcomere shorten.

When a muscle contracts, the H bands of the sarcomere shorten.

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Similar questions

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

upon contraction of sarcomere in skeletal muscle fibres , reduction is not observed in?

1. length of actin filaments

2. size of region enclosed by 2 z lines

3. h zone

4. i band

Q. Identify the correct statements.

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

Q. During skeletal muscle contractions following events can occur:
I. I-band shortens
II. A-band shortens
III. H-zone shortens
IV. Sarcomere contract
V. ATP changes to ADP and Pi
Choose the option with incorrect events.

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