Question

【題目】為研究交感神經(jīng)和副交感神經(jīng)對(duì)心臟的支配作用，分別測(cè)定狗在正常情況、阻斷副交感神經(jīng)和阻斷交感神經(jīng)后的心率，結(jié)果如表所示。下列分析不正確的是（ ）

A．副交感神經(jīng)興奮引起心臟搏動(dòng)減慢

B．對(duì)心臟支配占優(yōu)勢(shì)的是副交感神經(jīng)

C．交感神經(jīng)和副交感神經(jīng)的作用是相互協(xié)同的

D．正常情況下，交感神經(jīng)和副交感神經(jīng)均可檢測(cè)到膜電位變化

Answer 1

【答案】C

【解析】由圖知，阻斷副交感神經(jīng)心率大幅度提高，說(shuō)明副交感神經(jīng)對(duì)心臟搏動(dòng)起抑制作用，A正確；由圖知，阻斷副交感神經(jīng)心率大幅度提高．阻斷交感神經(jīng)心率降低的變化并不明顯，B正確；阻斷副交感神經(jīng)，心率大幅度提高，說(shuō)明副交感神經(jīng)對(duì)心臟搏動(dòng)起抑制作用．阻斷交感神經(jīng)心率降低，說(shuō)明交感神經(jīng)對(duì)心臟搏動(dòng)起促進(jìn)作用．副交感神經(jīng)與交感神經(jīng)的作用相互拮抗，C錯(cuò)誤；阻斷副交感神經(jīng)，阻斷交感神經(jīng)，心率均有變化，說(shuō)明正常情況副交感神經(jīng)與交感神經(jīng)均處于工作狀態(tài)．所以均可以檢測(cè)到膜電位變化，D正確。