问题 单项选择题

非去极化肌松药的主要作用机制是

A.激动N1受体
B.阻滞N1受体
C.激动N2受体
D.阻滞N2受体
E.增强胆碱酯酶活性

答案

参考答案:D

解析:N2胆碱受体阻断药又称骨骼肌松弛药。肌松药作用于神经肌肉接头的突触后膜(运动终板)上的N2受体,阻滞神经冲动的正常传递,导致骨骼肌松弛。

阅读理解

根据短文内容,判断下列句子的正(T)、误(F)。

       Do you use your right hands more or left hands more? Very few of us use both of our hands well.

Most people use right hands. Only about five people of a hundred use left hands. New-born babies can

take things with either of their hands, but in about two years, they like to use their right hands. Scientists

don't know why this happens. They've stunted it. They think our animal ancestors used their right hands,

this may not be true. Monkeys are our closest relations in the animal world. Scientists have found that

monkeys like to use one of their hands more than the other------but it can be either hand. There are as

many right-handed monkeys as the left-handed ones. Next time you visit the zoo and watch the monkeys

carefully. You'll see that some of them will use their right hands and others will use their left hands. But

men use their right hands better and this makes life difficult for the left-handed ones. We live in a

right-handed world.

       Some scientists have found out that more of successful people are left-handed, but they don't know

why. But they are working hard to discover the secret.

( )1. Very few of us use both of our hands.                                              

( )2. About 5% people use their left hands.          

( )3. The left-handed live easily because most people use their left hands.       

( )4. New-born babies use their right hands more.    

( )5. Scientists don't know the reason why more of successful people are left-handed.    

单项选择题 A1/A2型题