PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sarcomere
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H zone
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M line
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Z disc
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Detailed explanation-1: -The H-zone which consists of only thick filaments is an area of A-band. In the skeletal muscle fiber, the H zone is the area that is considered as the central gap between the actin filaments that extends through myosin filaments in the A-band. The myofibrils are arranged parallel to each of the muscle fibers.
Detailed explanation-2: -Each sarcomere has a central A band made of thick myosin filaments and two half I bands made of thin actin filaments on either side of the thick filaments leaving the central part of the thick filaments. This central part of thick filament, not overlapped by thin filament is called H zone.
Detailed explanation-3: -The H-zone is an area made up of only thick filaments (myosin). The I-band is thin filaments (actin) only, and the A-band is where there are thick and thin filaments. The Z-disc is dividing feature between sarcomeres and appears as dark lines in electron micrographs.