单选题A.甲状旁腺素分泌B.催产素分泌C.黄体生成素分泌D.胰岛素分泌

单选题关于微终板电位的叙述，正确的是

单选题 肺表面活性物质减少将导致（） A、肺难以扩张 B、小肺泡内压小于大肺泡内压 C、肺弹性阻力减小 D、肺泡表面张力降低 E、肺顺应性增加

单选题下列物质中，食物的特殊动力作用最强的是( )(2004年)

单选题女，45岁，左乳外上象限肿物约3个月，临床见肿物界不清，结节状，大小2.5cm×2.0cm×1.5cm，移动性差，最可能诊断是 A．乳腺增生症 B．乳腺纤维腺瘤 C．乳腺炎 D．乳腺癌 E．脂肪坏死

单选题肝素抗凝的主要机制是 A.抑制凝血酶原的激活 B.抑制FⅩ的激活 C.促进纤维蛋白吸附凝血酶 D.增强抗凝血酶Ⅲ活性

单选题A key reason the news media exists with special privileges is to be our watchdogs. Reporters' charge is to alert us when something is wrong, when human or natural disasters are about to threaten our welfare. When it comes to natural disasters, the news media do a praisable job of reporting the obvious, but not a very good one of preparing the public for what might happen, for alerting us to potential difficulties. When it comes to human disasters, especially problems in government and economic matters, the press has failed miserably. For example, Time magazine finally told the public in a recent cover story what only the most quick observers already knew: "The Great Retirement Ripoff (偷窃): Millions of Americans who think they will retire with benefits are going be shocked. How corporations are picking people's pockets—with the help of Congress...How can this legal?" Where was the media when each piece of corporate-biased legislation was being passed? Why wasn't Congress afraid to pass such legislation? Because the media has decided that news concerning Congress is of little interest to its audience. TV news managers have believed that economic and social issues are too complicated for the public to grasp. Newspaper editors occasionally print such stories, but mostly they concentrate on human-interest features, consumer health sections and entertainment. Hard news holes are shrinking and investigative journalism is carried out only on occasion. It is too difficult and costly. Besides, it antagonizes advertisers while seldom increasing circulation. Magazines that would look into such subjects seem to be dying out. The result is that no one is watching the rich and powerful so they can do almost anything with impunity (不受惩罚). Millions of Americans have been robbed in broad daylight while the news media has busied itself with celebrity trials and sensational crime stories. Corporations steal the public blind under legislation authorized by government officials. Companies file for bankruptcy protection, cutting off medical and life-insurance benefits for retirees. It isn't a new phenomenon. For the most part, today's press has let down the American public time and time again. If it seems to be getting worse, it's because there are so many segments of the media that should be telling us, in an accurate and fair manner, what our elected officials are doing before it's too late to take action. It's harder to blame corporations because they make no bones about their mission: make as much money as possible at all costs. Those in Congress are supposed to protect us and look out for our interests. Yet, it appears they constantly help their powerful supporters who often buy their offices for them. No one is doing the right thing. The joke apparently is on all of us—the old and the sick who will have no help in the future and the young burdened with the debt of caring for their impoverished elders for the rest of their lives.

单选题家兔静脉内注入20％葡萄糖10mL，尿量将增加，其原因是( )(1997年)

单选题机体保钠的主要激素是( ) A．生长素 B．雌激素 C．ADH D．醛固酮

单选题化脓性炎渗出物的特征性成分是

单选题迷走神经兴奋导致心肌收缩力减弱的机制为 A.抑制钙通道 B.激活IKach通道 C.抑制4期内向电流If D.ACh作用于M胆碱能受体，使肌质网Ca2+释放减少

单选题下列哪项是脊髓小脑的后叶中间带受损所特有症状( ) A．肌张力降低 B．偏瘫 C．静止性震颤 D．意向性震颤 E．位置性眼震颤

单选题下列属于骨骼肌兴奋-收缩偶联的过程是

单选题全身体表感觉在大脑皮层的投射区主要位于

单选题 肾脏内髓部高渗尿的形成与下列何种因素有关（ ） A、K+ B、NaCl C、NaCl和尿素 D、NaCl和KCl

单选题关于心肌有效不应期的叙述，哪项是正确的

单选题平静呼吸时，肺内压在下列哪个时相中低于大气压

单选题哪项不符合腺泡中央型肺气肿

单选题合成血红蛋白的基本原料是( )(2011年)

单选题在下列各血管中，血压波动幅度最大的是 A．主动脉 B．股动脉 C．毛细血管 D．微静脉