Deviations from all‐or‐none behavior in a molluscan unstriated muscle: Decremental conduction and augmentation of action potentials

Schmandt, W; Sleator, W. W.

doi:10.1002/jcp.1030460304

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…The large spike-like potentials resembled muscle action potentials described by Fletcher (1937a), Prosser, Curtis & Travis (1951), and Schmandt & Sleator (1955). Both large and small spike-like potentials probably represent an active muscle response which may or may not 232…”

Section: Discussionsupporting

confidence: 63%

See 1 more Smart Citation

Innervation and activity of a molluscan smooth muscle

Twarog¹

1960

The Journal of Physiology

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Section: Discussionsupporting

confidence: 63%

“…The intramuscular distribution of nerve endings is uncertain. Hoyle (1957) considered that Schmandt & Sleator (1955) demonstrated intramuscular conduction via multiterminal nerve fibres running the length of the byssus retractor muscle. Schmandt & Sleator had interpreted their data as implying true decremental conduction along muscle fibres.…”

Section: Discussionmentioning

confidence: 99%

Innervation and activity of a molluscan smooth muscle

Twarog¹

1960

The Journal of Physiology

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“…ABRM of Mytilis and pharynx retractor of Helix. The existence of maaximal twitches has been claimed in the Helix muscle (Bozler, 1930) and denied in the ABRM (Schmandt & Sleator, 1956). On this issue we do not consider our experiments to be conclusive because of the possible damage to the muscles with very strong shocks.…”

Section: Responses To Single Shocksmentioning

confidence: 70%

Contraction in molluscan smooth muscle

Abbott¹,

Lowy²

1958

The Journal of Physiology

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“…It has also been shown (Twarog (20)) that when contractions are initiated by stimulation of the nerves supplying the byssus retractor or when spontaneous contractions appear, large, synchronous potential changes are seen, which are similar in amplitude and duration to potentials described as the muscle action potential by Fletcher (14), Prosser et al (15), and Schmandt and Sleator (16). There is very little to suggest that the asynchronous activity which the small potential changes probably represent is associated with a means of muscle activation which, in and of itself, is capable of maintaining the high tensions achieved by the muscle when activated by D. e. stimuli.…”

Section: Discussionmentioning

confidence: 89%

The Basis for Prolonged Contractions in Molluscan Muscles

Johnson

Twarog

1960

The Journal of General Physiology

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TWO basically different hypotheses have been advanced to explain the behavior of molluscan muscles in eases in which relaxation of the mnscle is extraordinarily prolonged. In one hypothesis, tetanic activation due to prolonged activity in an intrinsic ganglion network is postulated; in the other, changes in the mechanical properties of the muscle capable of maintaining tension generated by the contractile system are proposed. Experiments reported here were designed to test these hypotheses. Recordings were made of electrical activity in a number of circumstances in which the muscle relaxes slowly, and this activity was absent in some cases and in others was not found to correlate well with rate of relaxation. Quick release of the muscle during and after a stimulus which induced slow relaxation showed disappearance of the active state long before decay of tension. Contractile tension decreases with length below rest length whereas passive tension due to stretch following D. C. stimuli remains approximately independent of length. The latter has the same mechanical basis as prolonged relaxation following D. c. stimuli. Thus initial contractile tension and the tension remainder during prolonged relaxation appear to originate through different mechanisms. These results lead us to favor the second hypothesis above. A means by which this could be achieved in vivo is discussed. I N T R O D U C T I O NThe contractile responses of m a n y types of muscles, notably among the lamellibranehs, differ considerably from responses shown by vertebrate skeletal muscles, in that the duration of the relaxation phase of contraction depends on the kind of stimulus applied. The anterior byssus retractor muscle (ARBM) of the sea mussel, Mytilus edulis, responds to direct current stimuli differently than it does to alternating or repetitive stimuli. The latter stimuli produce contractions which are followed by relatively fast relaxation, complete within a matter of seconds; whereas D. e. stimuli produce contractions of approxiDr. Twarog did this work during the tenure of a Public Health Postdoctoral Research Fellowship of the National Heart Institute.

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Deviations from all‐or‐none behavior in a molluscan unstriated muscle: Decremental conduction and augmentation of action potentials

Cited by 10 publications

References 16 publications

Innervation and activity of a molluscan smooth muscle

Innervation and activity of a molluscan smooth muscle

Contraction in molluscan smooth muscle

The Basis for Prolonged Contractions in Molluscan Muscles

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