The Action of Potassium on Muscle- Preparations from Invertebrates
نویسنده
چکیده
Introduction Part I . The crop of Aplysia . . . . Technique The action of potassium The potassium : calcium ratio The action of rubidium and caesium The action of lithium The action of ammonium Discussion . Part I I . The crop of Helix Technique . The action of potassium Comparison with vertebrate plain muscle Part I I I . The heart of Mdia . Technique . The action of calcium and sodium The action of potassium Comparison with plain muscle . Summary . . . . . . . References . . . . . . .
منابع مشابه
Effects of ionic parameters on behavior of a skeletal muscle fiber model
All living cells have a membrane which separates inside the cell from it's outside. There is a potential difference between inside and outside of the cell. This potential difference will change during an action potential. It is quite common to peruse action potentials of skeletal muscle fibers with the Hodgkin-Huxley model. Since Hodgkin and Huxley summarized some controlling currents like inwa...
متن کاملContribution of potassium channels, beta2-adrenergic and histamine H1 receptors in the relaxant effect of baicalein on rat tracheal smooth muscle
Objective(s): Baicalein, a compound extracted from a variety of herbs, showed various pharmacological effects. This study evaluated the relaxant effects of baicalein and its underlying molecular mechanisms of action on rat’s isolated tracheal smooth muscle.Materials and Methods: Tracheal smooth muscle were contracted by 10 μM methacholin...
متن کاملMUSCARINIC RECEPTOR SUBTYPES IN SMOOTH MUSCLE FROM THE BODY OF HUMAN STOMACH
Up to date, there are four pharmacologically characterized subtypes of muscarinic receptors (M1, M2, M3 and M4). In our study we have investigated muscarinic receptor subtypes in smooth muscle layers of human stomach. Isolated preparations of longitudinal and circular muscle layers from human stomach were used. Acetylcholine, bethanechol, carbachol, pilocarpine and AHR -602 produced concen...
متن کاملEffects of ginger extract on smooth muscle activity of sheep reticulum and rumen
Reticulorumen hypomotility leads to the impaired physiologic functions of the digestive tract. Prokinetic action of ginger has been demonstrated in the laboratory animals and human. The aim of this study was to evaluate the effect of hydroalcoholic extract of ginger on contraction and motility of reticulum and rumen of ruminants. Collected samples of reticulum and rumen from eight sheep were in...
متن کاملPositive and Negative Inotropic Effects of Elevated Extracellular Potassium Level on Mammalian Ventricular Muscle
The effect of moderate elevation in extracellular potassium concentration (up to 12 mM) on contraction of cat ventricular muscle was examined. Isometric force development was recorded from eight excised trabeculae and from six coronary-perfused in situ papillary muscle preparations. Contraction in the steady state was variably affected, sometimes decreasing monotonically, sometimes remaining un...
متن کامل