从豚鼠回肠黏膜下小动脉记录到的兴奋性突触后电流的一些特性。
Some properties of excitatory junction currents recorded from submucosal arterioles of guinea-pig ileum.
作者信息
Finkel A S, Hirst G D, Van Helden D F
出版信息
J Physiol. 1984 Jun;351:87-98. doi: 10.1113/jphysiol.1984.sp015234.
Abstract
Excitatory junction potentials and excitatory junction currents have been recorded from short segments of arterioles taken from the submucosa of guinea-pig small intestine. Excitatory junction currents reached their peak amplitudes by 20 ms and then decayed, with a time course that could be described by a single exponential (mean time constant of decay approximately 50 ms). The null potential for excitatory junction currents obtained by extrapolation was near 0 mV. The time course of excitatory junction currents failed to show voltage sensitivity. Spontaneous excitatory junction currents had the same time course as evoked currents; the amplitudes of spontaneous currents were less than an order of magnitude different from that of evoked currents.
摘要
已从豚鼠小肠黏膜下层取出的小动脉短节段记录到兴奋性接头电位和兴奋性接头电流。兴奋性接头电流在20毫秒时达到峰值幅度，然后衰减，其时间进程可用单一指数描述（平均衰减时间常数约为50毫秒）。通过外推法得到的兴奋性接头电流的零电位接近0毫伏。兴奋性接头电流的时间进程未显示出电压敏感性。自发性兴奋性接头电流与诱发性电流具有相同的时间进程；自发性电流的幅度与诱发性电流的幅度相差不到一个数量级。
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