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一、钾的调节成人每天从饮食中摄入钾约1mEq/kg,几乎全部在回肠吸收。吸收钾的98%被泵入细胞内,以肌细胞为最大的贮存库。血浆钾含量通常是3.5～5mEq/L;而细胞内浓度则约150mEq/L,由几种调控机制维持钾的平衡。主要调节钾的器官是肾脏,不论有无醛固酮,远曲小管细胞都能吸收或分泌钾,但是血浆钾升高时醛固酮便释放。醛固酮刺激钾的分泌及钠和H~+的回吸。最重要的肾外调节是Na-KATP酶泵,这种酶把钾泵入细胞,并把钠泵出细胞。而此泵受肾上腺素
First, the regulation of potassium Daily intake of potassium from the diet of about 1mEq / kg, almost all absorbed in the ileum. 98% of the absorbed potassium is pumped into the cells, the largest reservoir of muscle cells. Plasma potassium content is usually 3.5 ~ 5mEq / L; while the intracellular concentration is about 150mEq / L, by several regulatory mechanisms to maintain potassium balance. The main organ that regulates potassium is the kidneys, whether or not aldosterone, distal convoluted tubules can absorb or secrete potassium, but aldosterone is released when plasma potassium is elevated. Aldosterone stimulates the secretion of potassium and the absorption of sodium and H ~ +. The most important extracorporeal regulation is the Na-KATP enzyme pump, which pumps potassium into cells and pump it out of cells. And this pump by adrenaline