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the claim

Sarcomere bands in skeletal muscle cells exhibit optical isotropy

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Sarcomere bands in skeletal muscle cells exhibit optical isotropy?

No. Skeletal muscle sarcomeres contain both isotropic (I) and anisotropic (A) bands, meaning the sarcomere bands do not uniformly exhibit optical isotropy.

Verdict: REFUTED · 0 sources for, 4 against · Last checked

The analysis

The claim states that sarcomere bands in skeletal muscle cells exhibit optical isotropy. However, classical and modern histological and polarization optics studies demonstrate that while the I-band is isotropic, the A-band is distinctly anisotropic (birefringent) due to the presence of myosin filaments. Therefore, the claim that sarcomere bands exhibit optical isotropy is refuted by the literature.

Evidence against · 4
An investigation of cross striations and myosin filaments in muscle.
1946
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Hall, C., Jakus, M. A., & Schmitt, F. (1946). An investigation of cross striations and myosin filaments in muscle.. doi.org. https://doi.org/10.2307/1538060

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More against · 3
In vivo detection of exercised-induced ultrastructural changes in genetically-altered murine skeletal muscle using polarization-sensitive optical coherence tomography.
2006
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Pasquesi, J. J., Schlachter, S., Boppart, M., Chaney, E., Kaufman, S., & Boppart, S. (2006). In vivo detection of exercised-induced ultrastructural changes in genetically-altered murine skeletal muscle using polarization-sensitive optical coherence tomography.. doi.org. https://doi.org/10.1364/OE.14.001547

THE FINE STRUCTURE OF STRIATED MUSCLE
1956
Get citation
Hodge, A. J. (1956). THE FINE STRUCTURE OF STRIATED MUSCLE. doi.org. https://doi.org/10.1083/jcb.2.4.131

Magnetic susceptibility anisotropy outside the central nervous system.
2017
Get citation
R, D., L, X., H, W., & C, L. (2017). Magnetic susceptibility anisotropy outside the central nervous system.. doi.org. https://doi.org/10.1002/nbm.3544

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What does the evidence say?

The claim states that sarcomere bands in skeletal muscle cells exhibit optical isotropy. However, classical and modern histological and polarization optics studies demonstrate that while the I-band is isotropic, the A-band is distinctly anisotropic (birefringent) due to the presence of myosin filaments. Therefore, the claim that sarcomere bands exhibit optical isotropy is refuted by the literature.

Receipt History
first checked06 Aug 2026
judged → REFUTED · 1406 Aug 2026
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