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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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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.

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.

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 ?

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

Assertion : Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Reason : The central part of thick filament is not overlapped by thin filaments in a resting state.

Fill in the blanks. a. The light band contains actin and is called I band. b. The thick filaments in the .....2 band are held together in the middle of this band by a thin fibrous membrane called .3. line. c. In the centre of each ‘1‘ band is an elastic fibre called ...4... line which bisects it, d. The central portion of the thick filament which is not overlapped by thin filaments is called the ...'5'

Consider the following statements each with one or two blanks. (i) Repeated activation of the muscle can lead to the accumulation of (A) due to anaerobic breakdown of glycogen in them, causing fatigue. (ii) The globular head of meromyosin is an active ATPase enzyme and has binding sites for (B) active sites for (C) . This centre part of thick filament, not overlapped by thin filaments is called the (D) . Which one of the following options correctly fils the concerned blanks ?

Consider the following statements each with one or two blanks. (i)Repeated activation of the muscles can lead to the accumulation of (1) to anaerobic breakdown of glycogen in them, causing fatigue. (ii)The globular head of meromyosin is an active ATPase enzyme and has binding sites for(2) and active sites for(3) (iii)This central part of thick filament, not overlapping by thin filaments is called the(4)

Assertion : During muscle contraction I-band and A-band get reduced. Reason :- During contraction thin filament slides over myosin filament.

A2Z-LOCOMOTION AND MOVEMENT-Section A: Topicwise Questions Topic 3 : Mechanism Of Muscle Contraction
  1. In the given figure how many sarcomeres are seen?

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  2. Read the following statements and find out the incorrect statement.

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  3. Statements: 1. A bands are dark and contain myosin.  I-bands are ligh...

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  4. During contraction of muscles Ca^(2+) attaches to

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  5. Substance that accumulates in a fatigued muscle is

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  6. Muscle band that remains unchanged during contraction and relaxation o...

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  7. Match the following and mark the correct option {:("Column I", " ""C...

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  8. ATPase enzyme needed for muscle contraction is located in " ...

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  9. The functional unit of contractile system in a striated muscle is

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  10. Which one is a bone of forelimb?

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  11. Red muscles fibres are rich in

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  12. The reactions which change lactic acid into glycogen

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  13. Sliding filament theory of muscle contraction was given by

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  14. Which is true of muscle contraction?

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  15. During muscle contraction

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  16. Which of the following ions help in muscle contraction ?

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  17. During strenous exercise glucose is converted into

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  18. Which of the following is a source of energy for muscle contraction ?

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  19. Which one yields ATP required for muscle contraction?

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  20. EDTA injected into muscles combines with Ca^(2+) and

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