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Muscle

Functional un...

Question

Functional unit of a striated muscle is

A

I band.

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B

Z 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 unit of a striated muscle. This means it is the most basic unit that makes up our skeletal muscle. Sarcomeres are connected end to end by Z lines along the length of each myofibril.

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Similar questions

Q. During muscle contraction, which of the following shortens?
(i) A band
(ii) I band
(iii) 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. Sarcomere is the functional unit of contraction in a muscle fibre. Identify the portion of myofibril that constitutes a sarcomere

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. Short / Long answer type questions.
Describe the structure of a myofibril of a striated muscle.

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