The contractile apparatus of the adductor muscles in Anodonta cygnea L. (mollusca, pelecypoda)

I. Zs.-Nagy, J. Salánki, N. Garamvölgyi

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4 Citations (Scopus)

Abstract

The ultrastructure of white and yellow adductors was investigated in relaxed, in catch, and in isotonically contracted states. It was found that in the relaxed state a special form of thin filaments of 40-100 Å thickness can be observed showing an axial periodicity similar to that of the thick ones. They are localized in relatively large areas containing no thick filaments. The thin filaments are only of 40-50 Å thickness in the contracted states and the axial periodicity occures only rarely. In both kinds of muscle the number of thick filaments per unit area significantly increases in the catch state as compared to the relaxation. The thick filaments are built up from subfilaments; their thickness increases significantly in the white (tonic) adductor during the tonic contraction; they do not themselves contract, however. There is indirect evidence that they increase in length at the same time. These latter phenomena can be assumed as the morphological manifestation of increased crystallization of paramyosin. The parallelism of filaments partly ceases in catch state, while in isotonic contraction it disappears completely. The results indicate the validity of the independent catch hypothesis.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalJournal of Ultrasructure Research
Volume37
Issue number1-2
DOIs
Publication statusPublished - 1971

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Anodonta
Mollusca
Periodicity
Isotonic Contraction
Muscles
Tropomyosin
Crystallization
Reproducibility of Results

ASJC Scopus subject areas

  • Molecular Biology
  • Anatomy

Cite this

The contractile apparatus of the adductor muscles in Anodonta cygnea L. (mollusca, pelecypoda). / Zs.-Nagy, I.; Salánki, J.; Garamvölgyi, N.

In: Journal of Ultrasructure Research, Vol. 37, No. 1-2, 1971, p. 1-16.

Research output: Contribution to journalArticle

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