Active relaxation of unstriated muscle


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ABSTRACT Ramsey and Street1, working on single muscle fibres, concluded that relaxation in skeletal muscle was active. Prof. A. V. Hill2 has conclusively shown that relaxation in skeletal


muscle is passive. We stimulated the frog's rectus abdominis with potassium salts and acetylcholine and did not find any active relaxation. In unstriated muscle relaxation is active


under some conditions and passive under others3–5. In unstriated muscle there would appear to be two cycles: in one, the energy for contraction is derived from chemical stores; in the other,


the energy for contraction is derived from energy previously stored in the structure. Striated muscle appears to possess the former cycle only. This, we think, is the fundamental difference


between the two kinds of muscle. SIMILAR CONTENT BEING VIEWED BY OTHERS ELECTROMYOGRAPHY OF THE MUSCLE SPINDLE Article Open access 10 March 2022 SPONTANEOUS MYOGENIC FASCICULATION


ASSOCIATED WITH THE LENGTHENING OF CARDIAC MUSCLE IN RESPONSE TO STATIC PRELOADING Article Open access 20 July 2021 THE FORCE OF THE MYOSIN MOTOR SETS COOPERATIVITY IN THIN FILAMENT


ACTIVATION OF SKELETAL MUSCLES Article Open access 18 November 2022 ARTICLE PDF REFERENCES * Ramsey, R. W., and Street, S. F., _J. Cell. Comp. Physiol._, 15, 11 (1940). Article  CAS  Google


Scholar  * Hill, A. V., _Proc. Roy. Soc._, B, 136, 420 (1949). Article  ADS  CAS  Google Scholar  * Singh, S. I., and Singh, I., _Curr. Sci._, 17, 306 (1948). CAS  PubMed  Google Scholar  *


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Singh, I., _J. Physiol._, 98, 12 (1940). Article  CAS  Google Scholar  * Bharadwaj, U. R., and Singh, I. (unpublished observations). * Singh, S. I., and Singh, I., _Proc. Ind. Acad. Sci._,


B, 27, 127 (1948). Google Scholar  * Singh, I., _Proc. Ind. Acad. Sci._, B, 29, 190 (1949). Google Scholar  * Singh, S. I., and Singh, I., _Proc. Ind. Acad. Sci._, B, 32, 12 (1950). Google


Scholar  * Burn, J. H., and Vane, J. R., _J. Physiol._, 108, 104 (1949). Article  CAS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Physiological


Laboratory, S.N. Medical College, Agra SUNITA INDERJIT SINGH & INDERJIT SINGH Authors * SUNITA INDERJIT SINGH View author publications You can also search for this author inPubMed Google


Scholar * INDERJIT SINGH View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS


ARTICLE SINGH, S., SINGH, I. Active Relaxation of Unstriated Muscle. _Nature_ 166, 647 (1950). https://doi.org/10.1038/166647a0 Download citation * Issue Date: 14 October 1950 * DOI:


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