题目

阅读下面的短文，并根据短文内容，按要求答题。 Are you often free (空闲的) on weekends? Tim had a busy weekend last week. On Saturday morning, (1) he went to visit his grandmother with his parents. His grandmother lives in a small village (村庄). There Tim went to the mountains with his cousin. After dinner, he went shopping. In the evening, he saw an interesting comedy. On Sunday morning, Tim wanted to play soccer, (2) but it was rained very hard. So he had to stay at home. He wanted to play the guitar, but he couldn’t find his guitar. (3)So he did some readin下丘脑是机体调节内分泌活动的枢纽，根据图示回答相关问题： (1)从图甲可知，既能够传导兴奋又能够分泌激素的结构是________________，图示中该激素的受体细胞是______________________。(2)若相关腺体为甲状腺，寒冷条件下，该腺体分泌激素明显增加的意义是__________________________；该条件下，与其具有协同作用的激素是______________。(3)若相关腺体为性腺，则其分泌的激素对受体细胞的作用如图乙所示，该激素能影响靶细胞遗传信息表达的原因是________________________________，该激素能在血液中维持相对稳定依赖于激素调节的_________ 机制。人体内必须源源不断的产生激素，原因是___________________________________ 。(4)人体的生长激素是由________分泌的。某生物兴趣小组的同学设计实验对“过量使用生长激素可降低胰岛B细胞的敏感度”进行验证。实验材料及用具：健康小鼠若干只、生长激素溶液、胰岛素溶液、生理盐水、血糖含量检测仪、葡萄糖溶液、注射器等。实验前对小鼠饲喂等量大量的葡萄糖溶液。①实验的自变量为____________________，实验中需监测_______________。②实验时还需进一步对实验组小鼠注射适量的胰岛素，继续监测其血糖含量的变化情况，其目的是________________________________________________。