MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The thin filaments are firmly attached to
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M-line
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A-line
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Z-line
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I-line
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Explanation:
Detailed explanation-1: -There is an elastic fiber known as Z line which helps in bisecting each I-band. The thin filament is firmly joined to the Z line. The central part of the thick filament is not covered by the thin filament is known as the H-zone. During muscle contraction, the myosin heads come in close contact with the thin filaments.
Detailed explanation-2: -In each sarcomere, thin filaments emanate from the Z-lines, stretching through the I-bands to overlap with thick filaments in the A-band.
Detailed explanation-3: -The actin filaments are attached at their plus ends to the Z disc, which includes the crosslinking protein -actinin. The myosin filaments are anchored at the M line in the middle of the sarcomere.
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