A) Part between two H-lines
B) Part between two A-lines
C) Part between two I-bands
D) Part between two Z-lines
Correct Answer: D
Solution :
Huxley gave the fine structure of straited muscle fibre or myofibril. Each myofibril is made up of A-bands (dark band-anisotropic) and light bands (I-bands = isotropic). These two bands are made up of myosin and actin filament respectively. Each I-band is divided into two equal halves by a thin, fibrous and transverse zig-zag partition, called Z-band or Z-disc or Krause's membrane. The part of the myofibril between two successive Z lines functions as a contractile unit called sarcomere.
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