PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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H Zone
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M line
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Z disc
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A bands
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Detailed explanation-1: -Z-lines define the boundaries of each sarcomere. The M-line runs down the center of the sarcomere, through the middle of the myosin filaments. The I-band is the region containing only thin filaments. The H-zone contains only thick filaments.
Detailed explanation-2: -Z disc-is an area that traverses the I bands and marks the point of the connection between the two neighboring actin filaments. That said, the sarcomere can also be described as the structure between the two Z discs. M line-marks the middle of the sarcomere and contains the protein called myomesin.
Detailed explanation-3: -A sarcomere is defined as the segment between two neighboring Z-discs and is composed of long, fibrous proteins such as myosin and actin [7].