What is sarcomere? (a) Part between two H-lines (b) Part between two A-lines (c) Part between two l-bands
What is sarcomere?
(a) Part between two H-lines
(b) Part between two A-lines
(c) Part between two I-bands
(d) Part between two Z-lines
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Correct Option (d) Part between two Z-lines
Explanation:
Huxley reported the fine structure of striated muscle fibre or myofibril. Each myofibril is made up of A-bands (dark band anisotropic) and I-bands = isotropic (light 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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