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The effect of hydrogen ions and tonic contraction on the viscosity of unstriated muscle

  • Published:
Proceedings / Indian Academy of Sciences

An Erratum to this article was published on 01 December 1943

Summary and Conclusions

  1. (1)

    Plain muscle is capable of great changes in viscosity. The viscosity of plain muscle is about 100 to 1,000 times that of striated muscle and its movements correspondingly slower.

  2. (2)

    The viscosity of plain muscle increases as a result of tonic contraction, but is decreased during active contraction.

  3. (3)

    Hydrogen ions increase the viscosity; the optimum pH is 7·8, change on either side increasing the viscosity. The excitability is maximum at this pH.

  4. (4)

    Substances that decrease the rate of relaxation, increase the viscosity; plain muscle is thus able to keep up tension without expenditure of energy. During active contraction, viscosity decreases to facilitate movement.

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Authors and Affiliations

  1. Physiological Laboratory, Cambridge

    Inderjit Singh

  2. The Haffkine Institute, Bombay

    Inderjit Singh

Authors
  1. Inderjit Singh
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Additional information

Communicated by Lt.-Col. S. S. Sokhey, i.m.s., f.a.sc.

An erratum to this article is available at http://dx.doi.org/10.1007/BF03049911.

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Singh, I. The effect of hydrogen ions and tonic contraction on the viscosity of unstriated muscle. Proc. Indian Acad. Sci. 17, 13–19 (1943). https://doi.org/10.1007/BF03046187

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  • DOI: https://doi.org/10.1007/BF03046187

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