PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A line to A line
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Z line to Z line
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I band to I band
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H zone to H zone
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Detailed explanation-1: -A sarcomere is the region from one Z line to the next Z line. Many sarcomeres are present in a myofibril, resulting in the striation pattern characteristic of skeletal muscle. Myofibrils are composed of smaller structures called myofilaments .
Detailed explanation-2: -A-band: The length of a myosin within a sarcomere. M-line: The line at the center of a sarcomere to which myosin bind. Z-line: Neighboring, parallel lines that define a sarcomere. H-band: the area adjacent to the M-line, where myosin is not superimposed by actin.
Detailed explanation-3: -Sarcomeres are organized in series to make up a myofibril. 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.