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Structure of Skeletal Muscle

Question

The H-zone in the skeletal muscle fibre is due to
The absence of myofibrils in the central portion of A-band.
The central gap between myosin filaments in the A-band.
Extension of myosin filaments in the central portion of the A-band.
The central gap between actin filaments extending through myosin filaments in the A-band.

A

The central gap between myosin filaments in the A-band.

B

The absence of myofibrils in the central portion of A-band.

C

Extension of myosin filaments in the central portion of the A-band.

D

The central gap between actin filaments extending through myosin filaments in the A-band.

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Solution

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H-zone is the area of A-band without thin filaments. This zone contains only thick filaments excluding the thin filaments on either side. So H-zone in the skeletal muscle fiber is considered as area due to the central gap between the actin filaments extending through myosin filaments in the A-band.
So the correct option is C.

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Q1

One myosin filament in the myofibril of skeletal muscle fibre is surrounded by how many actin filaments?

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Q2

One myosin filament in the myofibril of skeletal muscle fibres is surrounded by how many actin filaments.

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Q3

In the transverse section of myofibril, the region of A band where thick and thin filaments overlap, each actin filament is surrounded by __(A)__thick filaments and each myosin filament is surrounded by __(B)__ thin filaments.

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Q4

Assess the statements.
1. A-bands of the muscle is dark and contain myosin.
2. I-bands are the light bands and contain actin.
3. During muscle contraction the A-band contracts.
4. The part between the two Z-lines is called as sarcomere.
5. The central part of thick filament, not overlapped by thin filament, called H-zone.
Of the above statements.

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Q5

Choose the option having all the correct statements:
I. Thin and thick filaments consist of myosin and actin, respectively.
II. The H-zone and I-band consists of only myosin and actin, respectively.
III. A-band contains both actin and myosin.
IV. M-line and Z-line are in the middle of thin and thick filaments, respectively.

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