实验温度对牛蛙神经冲动产生和传导的影响

Effects of Experimental Temperature on Nerve Impulse Generation and Conduction in Bull Frog(Rana catesbeiana)

测定了牛蛙(Rana catesbeiana)离体坐骨神经干在5、15、25、30、33、35、39℃七个温度条件下的动作电位波幅和传导速度.结果表明:温度显著影响牛蛙神经干的动作电位幅度和传导速度,牛蛙神经干动作电位幅度和传导速度不随温度的改变而呈同步的变化.在5-30℃温度范围内,牛蛙神经干的动作电位幅度随温度升高而增大,30℃后显著下降,39℃时最低;25、30、33℃动作电位的传导速度相对较快,温度低于25℃或高于33℃,牛蛙神经干的传导速度均呈显著的下降趋势.

We recorded the action potential range and conductive velocity of the nerve trunk of bull frog （Rana catesbeiana） at seven （5, 15, 25, 30, 33, 35 and 39℃） temperatures, respectively. The results showed thattesting temperature significantly affected the nerve impulse generation and conduction. The variations of the action potential range and conductive velocity with experimental temperature were asynchronous. The action potential range increased as temperature from 5 to 30℃; and decreased dramatically at higher temperatures.However, the nerve impulse conductive velocity was apparently faster at 25, 30 and 33℃ than that at lower than 25℃ or higher than 33℃.