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Structure

The smallest ...

Question

The smallest functional unit of a striated muscle is _____

A

Light band

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B

Dark band

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C

Myofibril

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D

Sarcomere

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Solution

The correct option is D
Sarcomere

The sarcomere is the functional contractile unit of striated muscles. It is composed of thick and thin filaments made up of contractile proteins arranged alternately to form the light band and dark band. A dark band and half of the two light bands together constitute a sarcomere.

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Similar questions

Q. Read the statement regarding myofibril and choose the correct option:
1. Each myofibril has alternate dark and light bands.
2. In the center of each A band is an elastic fiber called Z-line.
3. A and I bands are arranged alternately throughout the length of myofibril.
4. The sarcomere is the functional unit of contraction.
5. The central part of thick filament not overlapped by a thin filament is the M line.

Q. Sarcomere is the functional unit of contraction in a muscle fibre. Identify the portion of myofibril that constitutes a sarcomere

Q. Assertion :Assertion : The portion of the myofibril between two successive 2-lines Is considered as the functional unit of contraction oiled sarcomere Reason: Reason : During contraction, I-bands get reduced whereas A-bands retain the length, thereby causing shroting of the sarcomere

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

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