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arXiv physics/9711016physics.bio-phphysics.class-phq-bio
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细胞膜电位理论

A theory for the membrane potential of cells

Lars Petter Endresen, Kevin Hall

摘要:

我们给出了一个明确的公式细胞内和细胞外的离子浓度方面的细胞膜电位,并推导出方程的离子电流流过通道,交换器和生电泵基于简单的能量考虑和守恒定律。我们证明,由泵所做的工作等于细胞的势能加上能量损失,由于下坡离子通量通过通道和交换器。我们的方程预测了渗透压的变化。该理论在心脏起搏器中自发活动细胞的简单模型中得到说明。模型中模拟的动作电位和五种电流与实验结果吻合良好。该模型预测实验观察到的细胞内离子浓度的钾,钙和钠。在长时间模拟中,我们没有看到浓度值的任何漂移,相反,我们可以从相等的细胞内和细胞外离子浓度开始获得相同的渐近值。

英文摘要:

We give an explicit formula for the membrane potential of cells in terms of the intracellular and extracellular ionic concentrations, and derive equations for the ionic currents that flow through channels, exchangers and electrogenic pumps based on simple energy considerations and conservation laws. We demonstrate that the work done by the pump is equal to the potential energy of the cell plus the energy loss due to the downhill ionic fluxes through the channels and the exchanger. Our equations predict osmotic pressure variations. The theory is illustrated in a simple model of spontaneously active cells in the cardiac pacemaker. The simulated action potential and the five currents in the model are in excellent agreement with experiments. The model predicts the experimental observed intracellular ionic concentration of potassium, calcium and sodium. We do not see any drift of the values for the concentrations in a long time simulation, instead we can obtain the same asymptotic values starting with equal intracellular and extracellular ionic concentrations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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