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Sarcomere

The functiona...

Question

The functional unit of contractive system in striated muscle is______.

A

Cross bridges

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B

Myofibril

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C

Sarcomere

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D

Z-band

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Solution

The correct option is C
Sarcomere

The sarcomere is the fundamental unit of muscle structure. Its capacity for contraction is the essential trait that makes muscles work

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The functional unit of contractive system in striated muscle is______.

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

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