第3题: [单项选择]下列哪一项不利于增加脑血流 A. PaCO2 50mmHg B. ICP 25mmHg C. CVP 3cmH2O D. Hb 100g/L E. pH<7.35 参考答案:B 答案解析:PaCO2升高和酸中毒增加脑血流。低CVP有利于脑静脉回流,增加脑灌注压。血液稀释降低血液黏度,增加脑血流。ICP正常15mmHg,其升高使脑灌注压下降。
第16题: [单项选择]Passage TwoA. The heart pumps blood in two directions. B. The blood is circulated round the body in one direction only by the pumping action of the heart. C. The blood moved with a backward and forward motion. D. The heart pumps blood in all directions. 参考答案:B 答案解析:[解析] What did William Harvey find out in 1628