Harza T, Mátyás Lenke
Biol Bull. 1976 Oct;151(2):306-313. doi: 10.2307/1540663.
Sodium and potassium concentrations in different parts of the frog heart (sinus venosus, atrium and ventricle) were investigated at various seasons of the year. The sodium concentration showed a marked periodicity in all three parts of the heart: minimum in winter, maximum in summer. Potassium concentration showed no seasonal variations, except for reduction in potassium concentration of the ventricle in the second half of the year. The experimental results for sodium can be fitted by a sine curve, the differences between minimum (in winter) and maximum (in summer) representing 46.4% (for sinus venosus), 30.4% (atrium) and 34.0% (ventricle) of the spring-autumn values. Variation in the electrolyte concentration could be explained by changes in salt. and water metabolism induced by fluctuations in the temperature on one hand, and by the removal of the animals from their natural environment on the other.
在一年中的不同季节，对青蛙心脏不同部位（静脉窦、心房和心室）的钠和钾浓度进行了研究。钠浓度在心脏的所有三个部位都呈现出明显的周期性：冬季最低，夏季最高。钾浓度除了在下半年心室中的钾浓度有所降低外，没有季节性变化。钠的实验结果可以用正弦曲线拟合，最低值（冬季）和最高值（夏季）之间的差异分别占春秋值的46.4%（静脉窦）、30.4%（心房）和34.0%（心室）。电解质浓度的变化一方面可以通过温度波动引起的盐和水代谢变化来解释，另一方面可以通过将动物从其自然环境中移出这一因素来解释。
