题干

向小白鼠注射促甲状腺激素(TSH),会使下丘脑的促甲状腺激素释放激素(TRH)分泌减少.对此现象的解释有两种观点,观点一:这是TSH直接对下丘脑进行反馈调节的结果;观点二:这是TSH通过促进甲状腺分泌甲状腺激素,进而对下丘脑进行反馈调节的结果.两种观点孰是孰非?探究实验如下:

(一)实验步骤:

(1)将生理状况相同的小白鼠分为A、B两组,测定两组动物血液中____ 的含量.

(2)用手术器械将A组小白鼠的____ (器官)切除,B组做相同的外伤手术,但不摘除此器官.

(3)向A组小白鼠注射适量的一定浓度的促甲状腺激素溶液,向B组小白鼠注射____ .

(4)在相同且适宜的环境条件下饲养一段时间后,测定A、B两组小白鼠血液中____ 的含量.

(二)实验结果及结论:

(1)若____ ,则观点一正确;

(2)若____ ,则观点二正确.

(三)(1)现科学家已证实,观点二是正确的.由此可知,下丘脑细胞膜上含有识别____ 的受体,此受体不能与TSH结合,说明受体具有____ 性.

(2)有一种疾病是体内产生了大量TSH受体的抗体,该抗体可以结合TSH受体而充当TSH的作用,从而引起甲状腺功能异常.试分析并回答问题:

①这类疾病在免疫学上称为____ 

②安静状态下,同正常人相比,这种病人肝细胞的耗氧速率较____ (填“大”或“小”).

上一题 下一题 0.0难度 选择题 更新时间:2019-02-23 08:26:50

答案(点此获取答案解析)

\u4fc3\u7532\u72b6\u817a\u6fc0\u7d20\u91ca\u653e\u6fc0\u7d20,\u7532\u72b6\u817a,\u7b49\u91cf\u7684\u76f8\u540c\u6d53\u5ea6\u7684\u4fc3\u7532\u72b6\u817a\u6fc0\u7d20\u6eb6\u6db2,\u8840\u6db2\u4e2dTRH,A\u7ec4\u5c0f\u767d\u9f20\u548cB\u7ec4\u5c0f\u

同类题2

阅读短文,从每题所给的四个选项(A、B、C、和D)中,选出最佳选项.

        Salvador Dali (1904-1989) was one of the most popular of modern artists. The Pompidou Centre in Paris is showing its respect and admiration for the artist and his powerful personality with an exhibition bringing together over 200 paintings, sculptures, drawings and more. Among the works and masterworks on exhibition the visitor will find the best pieces, most importantly The Persistence of Memory. There is also L’Enigme sans Fin from 1938, works on paper, objects, and projects for stage and screen and selected parts from television programmes reflecting the artist's showman qualities.

        The visitor will enter the World of Dali through an egg and is met with the beginning, the world of birth. The exhibition follows a path of time and subject with the visitor exiting through the brain.

        The exhibition shows how Dali draws the viewer between two infinities (无限). “From the infinity small to the infinity large, contraction and expansion coming in and out of focus: amazing Flemish accuracy and the showy Baroque of old painting that he used in his museum-theatre in Figueras,” explains the Pompidou Centre.

        The fine selection of the major works was done in close collaboration (合作)with the Museo Nacional Reina Sofia in Madrid, Spain, and with contributions from other institutions like the Salvador Dali Museum in St. Petersburg, Florida.

同类题4

阅读下面两首诗词,然后回答问题。
                                                                                                   滁州西涧
                                                                                                                韦应物
                                                                                独怜幽草涧边生,上有黄鹂深树鸣。
                                                                                春潮带雨晚来急,野渡无人舟自横。
                                                                                        为陈同甫赋壮词以寄之
                                                                                                                    辛弃疾
                                                                                       醉里挑灯看剑,梦回吹角连营。
                                                                            八百里分麾下炙,五十弦翻塞外声,沙场秋点兵。
                                                                                    马作的卢飞快,弓如霹雳弦惊。
                                                                           了却君王天下事,赢得生前身后名。可怜白发生!
①对上面两首诗词中加点的词语,解释不正确的一项是(   )
A.幽草:幽深地方的草丛。
B.野渡:野外的渡口。
C.沙场:平旷的沙丘。
D.天下事:指收复中原统一天下的大业。
②《破阵子》中“五十弦翻塞外声”一句的意思是:                          
                                                                      ③判断下面对这两首诗词分析的正误,正确的打“√”,错误的打“×”。
A.《滁州西涧》是一首一著名的山水诗,写的是安徽滁州西涧的景色。(   )
B.《滁州西涧》在看似平常、平静的写景中,不动声色地蕴藉自己的心迹,这是本诗的高妙之处。(   )
C.《破阵子》首句“醉里挑灯看剑”形象地显示出作者杀敌的壮志。(   )
D.《破阵子》中“可怜白发生”一句既写出了作者对自己的爱恋,也表达出壮志难酬的沉痛。(   )