第10题: [单项选择]去甲肾上腺素兴奋β1受体,但又使心率减慢的原因是() A. 抑制传导 B. 抑制窦房结 C. 降低冠脉灌注 D. 反射性兴奋迷走神经 E. 抑制心肌收缩力 参考答案:D 答案解析:去甲肾上腺素主要兴奋α受体,引起血压升高,血压升高后可反射性兴奋迷走神经,减慢心率;其对β1受体只有较弱的兴奋作用,前-作用强于后-作用,整体表现为心率减慢,所以答案为D。
第14题: [单项选择]Which of the following concerning the document is NOT true A. The document will cover the next two decades. B. The document will win support from the delegates. C. The document will serve as a guideline. D. The document will be completed after the conference. 参考答案:D