题目内容

关于儿茶酚胺对心肌的正性变力作用机制，正确的描述是

A. 由心肌细胞膜上的β2受体介导
B. 以IP3和DG为第二信使
C. 细胞膜上Ca2+通道蛋白去磷酸化
D. 胞质内Ca2+来自细胞外和肌质网

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对肾素-血管紧张素系统的描述，正确的是

A. 肾素由肾球外系膜细胞合成和分泌
B. 血浆中Na+含量减少可刺激肾素分泌
C. 肾素可转变血管紧张素Ⅰ为血管紧张素Ⅱ
D. 血管紧张素Ⅱ主要刺激醛固酮分泌

下列哪种物质可使心功能曲线左上移

A. 肾上腺素
B. H+浓度升高
C. 乙酰胆碱
D. 血管升压素

一般情况下，动脉收缩压的高低主要反映

A. 心排出量
B. 每搏量
C. 每搏做功
D. 外周血管阻力

COMMUNITY ANNOUNCEMENTSCensus night is November 8. Remember to fill in the census form you received in the mail to make sure that you and your family members are (144) .Tick off one of the boxes asking you whether you are married or, if you are single, and specify the number of (145) you have if you are married, in the space provided. Previous census forms have been quite confusing, and (146) residents did not respond accurately, leading to the gross under-reporting of our actual 146（）

A. much
B. many
C. as
D. whole