问题 问答题 简答题

结合认知障碍的发病机制,我们可以考虑从哪几个方面入手复制痴呆动物模型?

答案

参考答案:

认知障碍发生与大脑皮层功能和结构的异常有关。结合认知障碍的病因和发病机制可考虑从以下几个方面复制认知障碍的动物模型。

(1)改变脑内神经递质,神经肽或神经营养因子的含量:如改变脑中多巴胺含量,减少脑中乙酰胆碱含量等。

(2)造成脑组织特定蛋白质异常聚集:如过度激活蛋白激酶和(或)抑制蛋白磷酸酯酶导致tau蛋白被异常磷酸化,复制AD样动物模型。

(3)复制脑组织缺血缺氧模型:由于神经元对缺血、缺氧非常敏感,故通过夹闭双侧颈总动脉造成脑组织缺血缺氧复制认知障碍的动物模型。

(4)炎症因子刺激:如在动物海马或基底核处注入LPS或IL-1。

(5)其他::劣性应激或药物、酒精干预。

单项选择题

Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can be best accommodate such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. Because they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (53) that comes from achieving success and knowing that their accomplishments are admired by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (54) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (55) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide multiple opportunities for leadership, as well as for practice in successful (56) dynamics. Making friends is extremely important to teenagers, and many shy students need the (57) of some kind of organization with a supportive adult (58) visible in the background.

In these activities, it is important to remember that the young teens have (59) attention spans. A variety of activities should be organized (60) participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.

52().

A.care 

B.nutrition 

C.exercise 

D.leisure

判断题