PROPERTIES OF ACTION POTENTIALS IN DROSERA TENTACLES
PROPERTIES OF ACTION POTENTIALS IN DROSERA TENTACLES
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DOI：
10.1007/bf00386845
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发表时间：
1972-01-01
期刊：
影响因子：
4.3
通讯作者：
PICKARD, BG
中科院分区：
文献类型：
--
作者：
WILLIAMS, SE;PICKARD, BG
茅膏菜触手的动作电位与脊椎动物周围神经的动作电位相似，因为它们似乎由相对均匀的尖峰、可变的肩部或负后电位以及可变的正后电位组成。尖峰的峰值对应于高不应期，而低幅度的动作电位可能在负后电位期间容易被激发。负后电位期间激发的动作电位似乎与周围神经的动作电位不同，因为它们的持续时间异常短暂。与周围神经的情况明显不同的是动作电位的持续时间取决于它与前一个动作电位之间的间隔。在室温下，动作电位以大约 5 mm s-1 的速度从茎的颈部传播到其基部。传播可以人为地逆转，这与神经样细胞电耦合的可能性一致。
Action potentials ofDroseratentacles resemble those of vertebrate peripheral nerves in that they appear to be comprised of relatively uniform spikes, variable shoulders or negative after-potentials, and variable positive after-potentials. The peaking of the spike corresponds to a period of great refractoriness, while action potentials of low amplitude may be fired readily during the negative after-potential. The action potentials fired during the negative after-potential appear to be unlike those of peripheral nerves in that they are of abnormally brief duration. Also apparently different from the case in peripheral nerves is the dependence of the duration of an action potential on the interval separating it from the preceding action potential.Action potentials propagate from the neck of the stalk to its base at about 5 mm s-1at room temperature. Propagation may be reversed artificially, consistent with the possibility that the neuroid cells are electrically coupled.