问题 问答题 简答题

试述痛风的发生机制。

答案

参考答案:

血液pH为7.4时,尿酸钠的溶解度约为0.42mmol/L(7mg/dl),尿酸浓度>0.42mmol/L时血浆尿酸已成过饱和状态,当浓度>0.48mmol/L持久不降,并出现血浆清蛋白及α1、α2球蛋白减少、局部pH降低或局部温度降低时即可使尿酸钠呈微小结晶析出。尿酸盐结晶较易沉淀在血管较少、基质中粘多糖含量较丰富的结缔组织、软骨和关节腔内。运动使这些组织容易发生缺氧,于是出现糖酵解加速,乳酸产生增多,pH降低,导致局部尿酸钠结晶析出。微小的尿酸钠结晶表面可吸附IgG,在补体参与、多型核白细胞吞噬作用及各种炎症介质作用下,导致组织发生炎症反应,此即为痛风。

单项选择题
翻译题

完成句子。阅读下列各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子。

1. Charlie Chaplin _____________ (打算忘记他令人烦恼的生活) and cheered up all the depressed

    Americans in his times. (intend)

2. Only after we saw several pictures of Premier Wen Jiabao in a series of nationwide natural disasters

    _____________ (我们才相信) he did get older. (convince)

3. My brother's house in Shenzhen is much smaller than ours, but _____________ (是我们房子的十倍贵).

    (time)

4. _____________ (有了……的武装) new farming methods, modern farmers are able to make use of smaller

    areas of land than in the past. (equip)

5. At this time yesterday afternoon our class _____________ (正在争论如何帮助) some of us get rid of the

    bad habit of sleeping in class. (argue).

6. Policemen _____________ (监视到那个人正进入) one of the biggest jewellery shops and surrounded the

    whole street quietly in no time. (observe)

7. Scarlet Ohara had never _____________ (后悔过举止) unlike a lady, which Captain Butler sharply pointed

    out and predicted. (regret)

8. Thousands of people think _____________ (挤入上海是值得的) during the 2010 Expo even if they have

    to suffer a lot. (worthwhile; crowd)

9. _____________ (满足于自己的生活) will keep a person from making further progress. (content)

10. What the successful enjoy doing is _____________ (战胜各种各样的困难) whatever they are. (overcome)