SummaryThe concentration of potassium in plasma and in red blood cells was determined in 948 horses. The coefficient of correlation between the two parameters was low. In 436 of these horses, which were clinically healthy, the red blood cell potassium (RBCK+) levels did not fit within a ...
Atwater, I., Dawson, C. M., Ribalet, B., and Rojas, E., 1979, Potassium permeability activated by intracellular calcium ion concentration in the pancreatic B-cell,J. Physiol. (London)288:575–588. CASGoogle Scholar Baker, P. F., 1972, Transport and metabolism of calcium ions in nerve...
pH:Acidemia decreases potassium excretion (see mechanisms below under causes of hyperkalemia). Alkalemia promotes potassium loss by causing potassium to move intracellularly into the tubular cell in exchange for hydrogen. The high intracellular potassium creates a favorable concentration gradient, facilitatin...
Extracellular potassium concentration affects the membrane potential of neurons, and, thus, neuronal activity. Indeed, alterations of potassium levels can be related to neurological disorders, such as epilepsy and Alzheimer’s disease, and, therefore, selectively detecting extracellular potassium would allow...
K+ CONCENTRATIONMATURATIONSURVIVALThe effects of K+-induced membrane depolarization were studied on the survival and biochemical parameters in mouse and rat cerebellar granule cells grown in micro-well cultures. Cell numbers were determined by estimating DNA content using the Hoechst 33258 fluorochrome ...
The Na+,K+-ATPase pump induces a potassium and sodium concentration gradient between the tubular fluid and the cell; sodium entry into the cells via sodium channels creates an electrical gradient favorable topotassium effluxfrom the cell into tubular fluid (Fig. 99-1).Sodium reabsorptioncreates a...
Losartan competes with the binding of angiotensin II to AT1 receptors. The concentration that inhibits 50% of the binding of angiotensin II (IC50) is 20 nM. Losartan (40?μM) affects ISC but prevents the effect of ANGII on ISC. Losartan significantly reduces Ang II-mediated cell proliferation...
The flow of ions into the cell is proportional to the concentration outside the cell while the flow out is proportional to the concentration inside. The energy difference between an ion of charge q outside and inside the neuron is qE when the membrane potential is E. Equilibrium of ion ...
because ammonium interferes with the diffusion of potassium from the clay lattice. Potassium influences the uptake of the two forms of nitrogen. The relative presence of K, Ca and Mg influences the concentration of each individual cation within the plant. In this, potassium seems to be the most...
Under the effect of Na+–K+–ATPase pumps at the basolateral membrane of the tubular cell (resulting in a high intracellular potassium concentration) and the effect of sodium absorption via the sodium channels at the luminal membrane (resulting in a negative electrical gradient in the lumen), ...