PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Actin filaments are bound to the edges/boundaries of the sarcomere, also known as the ____
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M-Line
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H-Zone
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Z-Disc
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A-Band
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Explanation:
Detailed explanation-1: -Z-discs can be defined as plate-like structures in sarcomeres to which the plus ends of actin filaments are localized, or they can be defined as the centre of the I-band.
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.
Detailed explanation-3: -The actin filaments are attached at their plus ends to the Z disc, which includes the crosslinking protein -actinin.
Detailed explanation-4: -Actin molecules are bound to the Z-line, which forms the borders of the sarcomere. Other bands appear when the sarcomere is relaxed.
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