2. in psychiatry, an unconscious defense mechanism in which unacceptable ideas, fears, and impulses are thrust out or kept out of consciousness. 3. gene r. enzyme repression interference, usually by the endproduct of a pathway, with synthesis of the enzymes of that pathway. gene repression the inhibition of gene transcription of an operon; in prokaryotes repressor binding to the operon is involved.
Hyperkalemia can result from increased potassium intake, decreased potassium excretion, or a shift of potassium from the intracellular to the extracellular space. The most common causes involve decreased excretion. Alone, excessive intake or an extracellular shift is distinctly uncommon.
This ratio must be maintained in order to enable the proper functioning of cell membranes. 2. Potassium is influenced by factors such as insulin and epinephrine, which increase cellular uptake, and high total body potassium levels, which reduce cellular uptake. 3. Within the kidney, aldosterone stimulates the secretion of potassium and the reabsorption of sodium.