如图表示刺激强度逐渐增加(S1~S8)时下一个神经元膜电位的变化规律

如图表示刺激强度逐渐增加(S1~S8)时下一个神经元膜电位的变化规律,下列叙述正确的是 (  )

A.刺激要达到一定的强度才能诱导神经细胞产生兴奋

B.刺激强度达到S5以后,随刺激强度增加兴奋逐渐增强

C.在S1~S4期间,细胞膜上没有离子的进出

D.在S5~S8期间,细胞膜的电位是外正内负

 

答案

A

从图中可以看出:刺激强度在S1~S4时,不产生兴奋,而S5之后出现兴奋,此时细胞膜的电位是外负内正,说明刺激必须要达到一定的强度才能诱导神经细胞产生兴奋,A选项正确,而D选项错误。S5~S8期间,虽然刺激强度在增加,但兴奋不变,说明B选项错误。在S1~S4期间,离子进出达到平衡,不改变膜电位,则C选项错误。

 

相关题目

在我国基本型乘用车(轿车)市场上,不但汽车降价可以起到促
在我国基本型乘用车(轿车)市场上,不但汽车降价可以起到促销作用,减少税费、油价下降也对拉动销量有明显影响。假设D和D1中有一条是汽车需求曲线
2010年8月11日哈尔滨召开第八届村委会换届选举工作会议,要
2010年8月11日哈尔滨召开第八届村委会换届选举工作会议,要求本次换届选举将推行无候选人选举方式,由选民根据自己的意愿直接选举产生村委会主任
My six-year-old granddaughter stared at me as if she were seeing me for the fir
My six-year-old granddaughter stared at me as if she were seeing me for the first time. “Grandma, you are an antique (古董),” she said. “You are old. Antiques are old. You are my antique.”
He prepared for the text _______ many times _______ he could answer the questio
He prepared for the text _______ many times _______ he could answer the questions quickly.        A. such, that       B. so, that      C. too, to         D. so, as   
Chinese authorities will launch a campaign to regulate Internet finance, which
Chinese authorities will launch a campaign to regulate Internet finance, which is growing rapidly but threatens social stability due to illegal activities. Departments of political and legal work at
美国飞行器制造商特拉弗吉亚公司(Terrafugla)近日宣布了其
美国飞行器制造商特拉弗吉亚公司(Terrafugla)近日宣布了其研发的世界首款飞行汽车―Transition,它拥有两个座位、四个轮子和能够折叠的翅膀,使用汽
理想变压器原线圈和两个副线圈的匝数分别为n1=880匝,n2=24匝
理想变压器原线圈和两个副线圈的匝数分别为n1=880匝,n2=24匝,n3=1 320匝。把原线圈n1接到220伏的交流电源上,两组副线圈n2、n3接到用电器上。测知副线
Most smokers say they _______ smoking to some degree but health experts suggest
Most smokers say they _______ smoking to some degree but health experts suggest that they should give it up ______ their health.  A. benefit; for the benefit of      B. benefit from; with the be

最新题目