题干

在人体中存在两种类型的突触,下图表示兴奋传来后这两类突触的突触后膜电位变化情况(乙酰胆碱和Gly为神经递质),下列有关叙述错误的是(    )

A:乙酰胆碱和Gly都储存在突触小泡内,受到刺激后以胞吐的方式释放

B:Gly作用于突触2的突触后膜时,膜外由正电位变为负电位、再变为正电位

C:a→b段电位变化的原因主要是Na+的迅速内流

D:突触1与突触2的突触后膜也可能是神经元细胞体的一部分

上一题 下一题 0.0难度 选择题 更新时间:2019-09-14 06:42:13

答案(点此获取答案解析)

B

同类题3

根据短文理解,完成下列各题。

      Before the spring Festival, which is the most important festival in China, millions of passengers are struggling to make the once-a-year trip home. Because of a power failure caused by snow, more than 136 trains were forced to stay in Hunan Province. Almost 150,000 passengers were stopped from going back their homes. It's reported that the losses will be 111.1 billion yuan.  

In central China's Hunan Province, one of the worst hit area, seven people have died and snow is affecting(影响) the lives of 25.22 million people in 14 cities and 112 counties across the province. Though the power supply resumed(恢复) at 4:00 p.m. Saturday, 50 trains remain stranded (滞留) between Hengyang City in Hunan and Guangzhou provinces. And in Guangzhou, an official with Guangzhou railway authorities said the number of stranded passengers in Guangzhou City alone could hit 600,000 on Monday if the situation continued.

How to solve the problems as soon as possible? In order to help the passengers meet their families and solve the traffic problems, our government do what they can. First, The Ministry of Railways Ordered 63 trains to go to Guangzhou via (通过) the Beijing-Kowloon Railway Line or Shanghai-Kunming Railway Line instead of the Beijing-Guangzhou Railway Line. Second, the ministry also organized 35 trains from Beijing, Wuhan and Nanchang cities to help transport the stranded passengers. The thirdly, Guangdong authorities sent 15 million text messages (短信)warning drivers not to take highways leading north. Some Guangzhou citizens try their best to help the stranded passengers, such as offering medicine, raising money and cooking free meals for the stranded students.

      The snow disaster(雪灾) is so terrible, but all of the Chinese and government is trying their best to succeed in beating it.