Potassium accumulation frog muscle: the association-induction hypothesis versus the membrane theory
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Potassium accumulation frog muscle: the association-induction hypothesis versus the membrane theory.
Zone (4); Santa Barbara Basin, California (5); Lake Biwa, Japan (6); Lake Washington, Washington (7); and the Amazon River (8). It is thought that perylene in these sediments results from the diagenesis of terrestrial pigments which have been rapidly deposited into a reducing sediment. This idea also seems to account for the presence of perylene in this sewage lagoon. We feel it is important no...
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15 صفحه اولBiphasic Potassium Contractures in Frog Muscle Fibers
Potassium-induced contractures were studied in single fibers from the semitendinosus muscle of Rana pipiens. Contractures elicited by solutions containing 60-117 mM potassium and 120 mM chloride were biphasic, consisting of a rapid initial contraction with a duration at 23 degrees C of less than 1 sec followed by a slow response with a duration of many seconds. At 13 degrees C, the initial resp...
متن کاملSodium and Potassium in Frog Muscle*
The potassium content of muscle fibers depends, in part, upon the potassium concentration of the external medium (Fenn and Cobb, 1934). In tissues intact in the body, it has been shown that sodium enters the fibers as potassium leaves, either because of low potassium in the blood (Heppel, 1939, 1940) or because of activity or fatigue (Fenn, 1938). Such findings suggest that the normal accumulat...
متن کاملSodium and Potassium in Frog Muscle*
The potassium content of muscle fibers depends, in part, upon the potassium concentration of the external medium (Fenn and Cobb, 1934). In tissues intact in the body, it has been shown that sodium enters the fibers as potassium leaves, either because of low potassium in the blood (Heppel, 1939, 1940) or because of activity or fatigue (Fenn, 1938). Such findings suggest that the normal accumulat...
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ژورنال
عنوان ژورنال: Science
سال: 1977
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.198.4323.1283