问题 问答题 简答题

充血、瘀血的概念各是什么?各自的形态变化怎样?

答案

参考答案:

充血指在某些致病因素的影响下,局部组织的小动脉及其毛细血管扩张,血液流入量增加,血含量增多。瘀血是由于

静脉回流障碍,血液瘀稳中有降在小静脉和毛细血管内,引起局部组织中静脉血液含量的增多。

组织充血时表现为局部体积增大,色泽鲜红,触摸温度增高,组织瘀血时表现为局部色泽暗红,触摸温度降低,体积增大,甚至引起水肿。

阅读理解

阅读理解。

     "Dream may be more important than sleep. We all need to dream," some scientists say.

      Dream takes up (占据) about one quarter (四分之一) of our sleeping time. People have a few dreams

each night. Dreams are like short films (电影). They are usually in color. Some dreams are like old films.

They come to us over and over again. That may be because the dreamer is worrying about something.

Dreaming may be a way of trying to find an answer.

     Some people get new ideas about their work from dreams. They may think about their work all day.

These thoughts can carry over into dreams.

     Sometimes we wake up with a good feeling from a dream. But often we can't remember the dream.

     Too much dreaming can be harmful (有害的). The more we sleep, the longer we dream. The mind is

hard at work when we dream. That is why (......的原因) we may have a long sleep and still wake up tired.

1. It may be less important to sleep than to _____.[ ]

A. think

B. dream

C. work

D. study

2. Dreams and films are usually _____. [ ]

A. very long

B. very sad

C. about work

D. in color

3. Why do some people often dream about their work? [ ]

A. Because they are tired in the daytime.

B. Because they are not interested in their work.

C. Because they may be thinking about their work all day.

D. Because they have too much work to do. 

4. The main idea of the story is _____. [ ]

A. what the dream is

B. people like to sleep

C. dreams are like films

D. we always remember dreams

5. Which of the following is true? [ ]

A. Sleeping without dreams takes up about a quarter of our sleeping time.

B. When we dream, the mind doesn't work.

C. Too much dreaming is good for health.

D. We may be still tired after a long sleep

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