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Locomotion and Movement

Which of the ...

Question

Which of the following is true of muscle contraction?

A

H-zone expands

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B

I-band expands

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C

A-Band remains constant

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D

The sarcomeres expands

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Solution

The correct option is C A-Band remains constant
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. The protein [tropomyosin] covers the myosin binding sites of the actin molecules in the muscle cell. Hence, A-Band remains constant is true of muscle contraction
So, the correct answer is 'A-Band remains constant'.

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

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

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ii. During contraction, I bands retain their lengths.
iii. During contraction, A bands get reduced in length.

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.
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2. I-bands are the light bands and contain actin.
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Of the above statements.

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