Question:easy
Myosin filament has a fixed length of?
Myosin filament has a fixed length of?
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Thick myosin filament is fixed at about 1.6 micrometers; thin actin about 1 micrometer.
Updated On: Jun 24, 2026
- 0.16 nm
- 1.6 micrometers
- 16 nm
- 1.6 mm
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The Correct Option is B
Solution and Explanation
Step 1: The sarcomere contains thick and thin filaments. The thick filament, made of myosin, has a constant length that does not change during contraction.
Step 2: Standard physiology texts give this thick-filament length as 1.6 micrometers. The thin actin filaments are shorter, around 1 micrometer, and the difference accounts for the A-band and I-band pattern.
Step 3: A quick scale check disposes of the wrong options. Values like 0.16 nm or 16 nm are smaller than the filament diameter, while 1.6 mm would be visible to the naked eye, which is impossible for a single filament. The micrometre value alone is plausible.
Step 4: The fixed myosin filament length is therefore 1.6 micrometers.
\[\boxed{1.6\ \mu m}\]
Step 2: Standard physiology texts give this thick-filament length as 1.6 micrometers. The thin actin filaments are shorter, around 1 micrometer, and the difference accounts for the A-band and I-band pattern.
Step 3: A quick scale check disposes of the wrong options. Values like 0.16 nm or 16 nm are smaller than the filament diameter, while 1.6 mm would be visible to the naked eye, which is impossible for a single filament. The micrometre value alone is plausible.
Step 4: The fixed myosin filament length is therefore 1.6 micrometers.
\[\boxed{1.6\ \mu m}\]
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