每题1分,共10分

1、 机体处于寒冷环境时甲状腺激素分泌增多属于

A.神经调节

B.自身调节

C.局部调节

D.体液调节

E.神经—体液调节

2、 CO2和NH3在体内跨细胞膜转运属于

A.单纯扩散

B.易化扩散

C.出胞或人胞

D.原发性主动转运

E.继发性主动转运

3、 组织兴奋后处于绝对不应期时其兴奋性为

A.无限大

B.等于正常

C.零

4、 当神经冲动到达运动神经末梢时可引起接头前膜

A.Na+通道关闭

B.Ca2+通道开放

C.K+通道关闭

D.CI—通道开放

E.CA+通道关闭

5、 生理情况下,肾小球的滤过分数约为

A.10％

C.30％

E.50％

6、 下列凝血因子中最不稳定的是

A.因子V

B.因子VII

C.因子X

D.因子XII

E.因子Ⅷ

7、 在一个心动周期中二尖瓣开放始于

A.等容收缩期初

B.等容收缩期末

C.心室射血期初

D.等容舒张期初

E.等容舒张期末

8、 下列关于心室肌细胞钠通道的叙述,错误的是

A.是电压依从性的

B.激活和失活的速度都快

C.可被河豚毒阻断

D.去极化到—40mV时被激活

E.只有Na+可以通过

9、 迷走神经兴奋使心率慢,是由于窦房结细胞发生下列哪种改变所致?

A.K+通透性降低

B.K+通透性增高

C.Ca+通透性增高

D.Na+通透性增高

E.CI—通透性增高

10、 肺表面活性物质减少时可导致

A.肺弹性阻力减小

B.肺顺应性增大

C.肺泡表面张力降低

D.小肺泡内压小于大肺泡内压

E.肺不易扩张

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