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Cardiac Cycle

The H-zone in...

Question

The H-zone in the skeletal muscle fibre is the

A

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

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B

extension of myosin filaments in the central portion of the A-band

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C

absence of myofibrils in the central portion of A-band

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D

central gap between myosin filaments in the A-band

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Solution

The correct option is A central gap between actin filaments extending through myosin filaments in the A-band
H-zone is the central gap of myosin (thick) filaments (not overlapped by actin (thin) filaments) but between the actin filaments in the A-band. A diagrammatic representation of skeletal muscle fibre is shown below:

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Similar questions

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

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

Q. 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.

Q. 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.

Q. 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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