. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 P. J. STEPHENS across the membrane (Florey and Hoyle, 1976). Evidence for this comes from the observation that the rate of spontaneous motor neuron firing can be changed by tem- perature-induced changes in the sodium pump (Arechiga and Cerbon, 1981). Irrespective of the mechanism that produces the two-phase relationship between temperature and membrane potential, one interesting phenomenon is that cold tem- peratures cause the muscle membrane to become depolarized above the excitation- contraction threshold, which is inde
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 P. J. STEPHENS across the membrane (Florey and Hoyle, 1976). Evidence for this comes from the observation that the rate of spontaneous motor neuron firing can be changed by tem- perature-induced changes in the sodium pump (Arechiga and Cerbon, 1981). Irrespective of the mechanism that produces the two-phase relationship between temperature and membrane potential, one interesting phenomenon is that cold tem- peratures cause the muscle membrane to become depolarized above the excitation- contraction threshold, which is independent of temperature (Dudel and Ruedel, 1968), and creates passive tension in the muscle (Harri and Florey, 1977; Fischer and Florey, 1981). The amount of tension produced is dependent upon the amount of depolar- ization (Orkand, 1962) and can be released by direct action of the inhibitor on the muscle fiber. This suggests that post-synaptic inhibition may play a significant role in the behavior of an animal at cold temperatures. Excitatory junctional potentials In many crustacean muscle fibers the amplitude and the time course of the nerve evoked excitatory junction potential (ejp) (Fig. 1 A, B) and the tension produced in the muscle decline with temperature (Harri and Florey, 1977; Stephens and Atwood, B 10°. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
