问题 问答题 简答题

神经组织的化学组成及代谢特点有哪些?

答案

参考答案:

主要有:①糖含量低以血糖为主要能源;②脂类含量高且独特代谢缓慢,糖鞘脂为神经组织的特殊脂;③脑的氨基酸池与其他组织不同,以谷氨酸、天冬氨酸和相关的氨基酸含量较高,与氨基酸衍生为神经递质的代谢有关;④水含量大离子转运活跃与突触功能的调控有关;脑的氧和能量消耗高,对缺氧耐受力极差。

填空题
阅读理解

It has been said that Lincoln was always ready to join in a laugh at himself. There is one particular story that he always told with great delight.

In his early days as a lawyer, Lincoln went from town to town to hear and judge legal(法律的)cases. During one of these trips, he was sitting in a train when a strange man came up to him. The stranger looked at the tall clumsy(笨拙的)lawyer and said that he had something he believed belonging to Lincoln. Lincoln was a bit puzzled. He had never seen the man before. He didn’t see how a total stranger could have something of his. Lincoln asked how this could be. The stranger pulled out a penknife and began to explain. Many years before, he had been given the pocketknife. He had been told to keep it until he was able to find a man uglier than himself.

Lincoln’s eyes always sparked when he reached this part of the story. The story always brought smiles to the faces of those who heard it. The tale itself was funny. But even more delightful was the fact that a man as great as Lincoln could still laugh at himself.

小题1:This passage is about        .

A.a stranger and his strange knife

B.Lincoln’s favorite story

C.meeting stranger in a train

D.Lincoln’s favorite penknife小题2:From the story we can infer that the stranger in the train         

A.liked to make friends

B.liked to tell jokes

C.collected penknives

D.was not handsome小题3:Lincoln was given the pocketknife for        

A.his appearance

B.a good laugh

C.being a lawyer

D.being good-humored小题4:Which of the following statements is right?

A.Lincoln, even though great, was not proud.

B.Lincoln was a great and proud man.

C.Lincoln lacked self-respect.

D.Lincoln had a good sense of humor.小题5: What does the word “sparked” in the last paragraph mean?

A.闪耀

B.暗淡

C.无神

D.忧伤