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Can someone help me with this, The H-zone in the skeletal muscle fibre is dueto:

The H-zone in the skeletal muscle fibre is due to:

  • Option 1)

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

  • Option 2)

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

  • Option 3)

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

  • Option 4)

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

 
Answers (1)
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H Zone -

In a resting state, the edges of thin filaments on either side of the thick filaments partially overlap the free ends of the thick filaments leaving the central part of the thick filaments.

- wherein

This central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone.

 

 

sarcomere -

The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.

- wherein

 

 


Option 1)

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

Option is incorrect

Option 2)

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

Option is incorrect

Option 3)

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

Option is incorrect

Option 4)

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

Option is correct

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