PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A band to A band
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H band to H band
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M line to M line
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Z line to Z line
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Detailed explanation-1: -The sarcomere is the fundamental unit of contraction and is defined as the region between two Z-lines. Each sarcomere consists of a central A-band (thick filaments) and two halves of the I-band (thin filaments ). The I-band from two adjacent sarcomeres meets at the Z-line.
Detailed explanation-2: -The Z-band (Z-line, Z-disc) defines the boundary of the sarcomere in striated muscle and bisects the I-band of neighbouring sarcomeres (Fig. 1a) [1].
Detailed explanation-3: -The sarcomere is defined as spanning from Z-line to Z-line (described in detail below), only a few micrometers long, and consists of an A band containing myosin (“thick”) filaments, which is flanked by two half I-bands made up of actin (“thin”) filaments.