【医学类职业资格】生理学练习试卷1-1及答案解析.doc

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生理学练习试卷 1-1 及答案解析(总分:2.00,做题时间:90 分钟)一、A1 型题(总题数:1,分数:2.00)1.形成 Na+、K+在细胞内外不均衡分布的原因是( )。(分数:2.00)A.安静时 K+比 Na+更易穿透过细胞膜B.兴奋时 Na+比 K+更易穿透过细胞膜C.K+的不断外流和 Na+的不断内流D.膜上载体和通道蛋白的共同作用E.膜上 Na+-K+依赖式 ATP 酶的活动生理学练习试卷 1-1 答案解析(总分:2.00,做题时间:90 分钟)一、A1 型题(总题数:1,分数:2.00)1.形成 Na+、K+在细胞内外不均衡分布的原因是( )。(分数:2.00)A.安静时 K+比 Na+更易穿透过细胞膜B.兴奋时 Na+比 K+更易穿透过细胞膜C.K+的不断外流和 Na+的不断内流D.膜上载体和通道蛋白的共同作用E.膜上 Na+-K+依赖式 ATP 酶的活动 解析:解析:钠泵是镶嵌在膜的脂质双分子层中的一种特殊蛋白质,它具有 ATP 酶的活性,可以分解 ATP使之释放能量,并能利用此能量进行 Na+和 K+逆浓度梯度的主动转运,因而钠泵就是一种被称 Na+、K+依赖式 ATP 酶的蛋白质。

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