First slide

Muscle

Question

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

Moderate

A

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

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

the absence of myfibrils in the central portion of A-band.
D

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

Solution

In a sarcomere, central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone. Within the H-zone is a thin M-line (from the German "Mittelscheibe", the disc in the middle of the sarcomere) formed of cross-connecting elements of the cytoskeleton.

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