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Statements: 1. A bands are dark and cont...

Statements: 1. A bands are dark and contain myosin. 
I-bands are light and contain actin.
3. During action, A band contracts.
4. Part between two Z-lines is sarcomere.
5. Central part of thin filaments, not overlapped by thick filaments is H-zone.

A

l, 2 and 3 are correct, 4 and 5 incorrect

B

1, 3 and 5 correct, 5 and 4 incorrect

C

l, 2 and 4 correct, 3 and 5 incorrect

D

l and 2 correct, 3, 4 and 5 incorrect

Text Solution

Verified by Experts

The correct Answer is:
C
.During action, A band remains the same.
Central part of thick filaments, not overlapped by thin filaments is H-zone.
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Read the following statements (A to D) and select the one option that contains both correct statements. A. Z-line is present in the centre of the light band. B. Thin filaments are firmly attached to the M-line. C. The central part of thick filaments, not overlapped by thin filaments is called Z-band. D. Light band contains only thin filaments.

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

Knowledge Check

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

    A
    1,2 and 3 are correct, 2 and 4 incorrect
    B
    1,3 and 5 correct, 2 and 4 incorrect
    C
    1,2 and 4 correct, 3 and 5 incorrect
    D
    1 and 2 correct, 3,4 and 5 incorrect.

  • Statements A-bands of the muscle are dark and contain myosin I-band are the light bands and contain actin During muscle contraction the A-band contracts The part between the two Z-lines is called as sarcomere The central part of thin filament, not over-lapped by thick filament is called H-zone of the above statements.

    A
    A,C,E are correct while, B,D are incorrect
    B
    A,B,C and E are correct while D is incorrect
    C
    A,B and D are correct while C and E are incorrect
    D
    A,B and C are correct while D and E are incorrect

  • Read the given Statements for skeletal muscles (i) Thin filaments are firmly attached to the Z - line . (ii) The light band is also called the I - band and contains mostly actin. (iii) A sarcomere is the functional unit of a myofibril between two adjacent A - bands . (iv) The central part of the thick filament , not overlapped by the thin filament is called the H - zone Which of these is/are CORRECT ?

    A
    i, ii, iii, iv
    B
    i, ii, iii
    C
    i, ii, iv
    D
    i, ii

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