Vázquez A, Jordana R, Larralde J
Rev Esp Fisiol. 1980 Dec;36(4):449-55.
The effect of calcium concentration on the Transmural Potential Difference and the Intensity of the Short-circuit Current in rat, chicken and laying hen small intestine has been studied in vitro both in the presence and absence of sodium. The results show that calcium, in the presence of sodium, produces an increase in potential and current intensity much greater in hen intestine than in chicken and rat. In the absence of sodium, the response of the potential as regards calcium concentration in hen intestine is parallel to the one obtained in the absence of sodium: a rise in the potential until it reaches a maximum value that corresponds to a calcium concentration of 10.8 mM in the medium, followed by a drop in the potential. However, rat intestine responds differently: the potential, negative at the serosal, becomes more and more positive with higher concentrations of calcium until it practically disappears.
在有钠和无钠的情况下，于体外研究了钙浓度对大鼠、鸡和产蛋母鸡小肠跨壁电位差及短路电流强度的影响。结果表明，在有钠存在时，钙使母鸡小肠的电位和电流强度增加的幅度远大于鸡和大鼠。在无钠时，母鸡小肠中电位对钙浓度的响应与无钠时获得的响应相似：电位先升高直至达到最大值，该最大值对应于培养基中10.8 mM的钙浓度，随后电位下降。然而，大鼠小肠的反应不同：浆膜侧为负的电位随着钙浓度升高变得越来越正，直至几乎消失。
