Department of Zoology, University of Chicago, Chicago.
J Gen Physiol. 1961 Jul 1;44(6):1131-42. doi: 10.1085/jgp.44.6.1131.
Sartorius muscles of R. pipiens may be enriched in sodium and depleted of potassium by prolonged soaking in the cold in K-free or low K Ringer's solution. Such K-depleted muscles take up potassium and extrude sodium when exposed to Ringer's solution containing 10 mM K at ordinary room temperature (ca. 20 degrees C), with no dependence on external Na ion concentration in either phase within fairly wide limits. Extrusion of excess fiber Na is demonstrated on single muscles using Na(24)-loaded tissues. Rate of exchange of excess fiber Na does not differ significantly from the rate of exchange of Na normally present in muscle fibers.
罗氏沼虾的沙氏肌可通过在低钾或无钾里氏液中长时间浸泡在冷水中而被钠离子富集和钾离子耗竭。当暴露于含有 10mM K 的里氏液中时，这种低钾耗竭的肌肉在普通室温（约 20°C）下会摄取钾并排出钠离子，两个阶段都与外部钠离子浓度无关，范围相当宽。用负载有 Na(24)的组织在单个肌肉上证明了过量纤维 Na 的排出。过量纤维 Na 的交换速率与肌肉纤维中正常存在的 Na 交换速率没有显著差异。
