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<title>答题系统</title>
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var questions = new Array();
//题目数组开始
questions[0] = new Array("1.内环境的稳态是指内环境理化性质","A 绝对稳定的状态","B 固定不变的状态","C 绝对静止的状态","D 动态平衡的状态","E 非平衡状态","D 动态平衡的状态")
questions[1] = new Array("2.正反馈的作用是使","A 人体血压稳定","B 人体内环境理化特性相对稳定","C 功能活动不断加强直到完成为止","D 体温保持相对稳定","E 功能活动减弱","C 功能活动不断加强直到完成为止")
questions[2] = new Array("3.细胞内外正常的Na+和K+浓度差的形成和维持是由于","A 膜在安静时对K+的通透性大","B Na+、K+易化扩散的结果","C 膜上Na+-K+泵的作用和膜的生物特性","D 膜对Na+的通透性大","E 膜上Na+、K+通道的作用","C 膜上Na+-K+泵的作用和膜的生物特性")
questions[3] = new Array("4.决定化学门控式通道蛋白构型改变的因素是","A 膜的去极化","B 膜的复极化","C 膜环境中特定的化学信号","D 膜环境中的Mg2+浓度","E 膜两侧Na+浓度","C 膜环境中特定的化学信号")
questions[4] = new Array("5.用直流电刺激神经纤维,在通电时兴奋发生在","A 阳极下方","B 阴极下方","C 阳极或阴极下方均可","D 阳极和阴极之间","E 阳极和阴极两点以外的地方","B 阴极下方")
questions[5] = new Array("6.兴奋性是指活组织或细胞接受刺激时","A 由相对静止变为活动","B 活动加强","C 发生的反应","D 发生反应的能力","E 发生的功能变化","D 发生反应的能力")
questions[6] = new Array("7.理论上讲,可兴奋细胞接受刺激产生动作电位的最高频率取决于 的长短","A 绝对不应期","B 相对不应期","C 超常期","D 低常期","E 动作电位持续时间","A 绝对不应期")
questions[7] = new Array("8.引起组织兴奋所需的最小刺激强度称","A 基强度","B 时值","C 阈电位","D 阈值","E 基值","D 阈值")
questions[8] = new Array("9.与动作电位形成有关的Na+通道是","A 化学门控通道","B 机械门控通道","C 电压门控通道","D 细胞间通道","E ACh门控通道","C 电压门控通道")
questions[9] = new Array("10.在一段神经纤维引发一次动作电位,必须先使膜电位达到","A 阈强度","B 阈值","C 阈电位","D 阈刺激","E 基强度","C 阈电位")
questions[10] = new Array("11.在电压钳实验中,将神经纤维膜内电位由静息电位突然固定在-30mV时,记录到的跨膜电流特点是","A 内向离子流","B 外向离子流","C 先内向后外向离子流","D 先外向后内向离子流","E 以上都不是","C 先内向后外向离子流")
questions[11] = new Array("12.神经纤维动作电位超射值的大小","A 接近于K+平衡电位","B 接近于Na+平衡电位","C Na+平衡电位减去K+平衡电位","D Na+平衡电位与K+平衡电位之和","E 锋电位与负后电位之和","B 接近于Na+平衡电位")
questions[12] = new Array("13.局部兴奋的扩布形式是","A 电紧张性扩布","B 跳跃式扩布","C “全或无”式的扩布","D 递增式电流扩布","E 不衰减式扩布","A 电紧张性扩布")
questions[13] = new Array("14.人工增加离体神经纤维浸浴液中的K+浓度,静息电位的绝对值将 ","A 不变","B 增大","C 减小","D 先增大后减小","E先减小后增大","C 减小")
questions[14] = new Array("15.神经肌接头处信息传递可被 阻断","A 阿托品","B 箭毒","C 乙酰胆碱","D 四乙基铵","E 河豚毒","B 箭毒")
questions[15] = new Array("16.肌肉收缩时,如后负荷越小,则 ","A 收缩最后达到的张力越大","B 开始出现缩短的时间越迟","C 缩短的程度越大","D 缩短的速度越小","E 等长收缩时间越长","C 缩短的程度越大")
questions[16] = new Array("17.骨骼肌兴奋-收缩耦联中起关键作用的离子是","A Na+","B Cl—","C Ca2+","D K+","E Mg2+","C Ca2+")
questions[17] = new Array("18.血浆晶体渗透压的作用是","A 维持血管内外的水平衡","B 维持细胞内外的水平衡","C 维持动脉血压的稳定","D 调节器官血流量","E 调节组织液的生成","B 维持细胞内外的水平衡")
questions[18] = new Array("19.枸椽酸钠抗凝作用的原理是","A 加强血浆中抗凝血酶的作用","B 与血浆中的Ca2+结合形成不易解离的络合物","C 加强组织因子抑制物的作用","D 加强肝素的抗凝作用","E 抑制Ⅻ因子的激活","B 与血浆中的Ca2+结合形成不易解离的络合物")
questions[19] = new Array("20.使血液凝固加速的因素是","A 粗糙面","B 低温","C 草酸盐","D 凝血酶调制素","E 尿激酶","A 粗糙面")
questions[20] = new Array("21.输血时主要应考虑供血者的","A 红细胞不被受血者的红细胞凝集","B 红细胞不发生叠连","C 血浆不使受血者的血浆发生凝固","D 红细胞不被受血者的血浆凝集","E 血浆不使受血者的红细胞发生叠连","D 红细胞不被受血者的血浆凝集")
questions[21] = new Array("22.以下有关输血原则的叙述错误的是","A. 供血、受血双方ABO血型必须相合","B 生育年龄妇女和反复输血者应考虑Rh血型相合","C 输血前必须进行交叉配血试验","D 交叉配血试验主侧凝集不能输血","E 交叉配血试验主侧不凝集,次侧凝集,紧急情况下也不能输血","E 交叉配血试验主侧不凝集,次侧凝集,紧急情况下也不能输血")
questions[22] = new Array("23.在一个心动周期中,心室内压力升至最高的时间是","A 等容收缩期末","B 等容舒张期末","C 快速射血期末","D 缓慢射血期末","E 房缩期末","C 快速射血期末")
questions[23] = new Array("24.心脏泵血过程中,心室充盈血液主要是由于","A 心房收缩的挤压作用","B 心室舒张的抽吸作用","C 胸内负压促进静脉回流","D 骨骼肌舒缩的挤压加速静脉血回流","E 重力作用加速静脉血回流","B 心室舒张的抽吸作用")
questions[24] = new Array("25.心脏每搏输出量占心室舒张末期容积的百分比称为","A 心脏指数","B 射血分数","C 心力储备","D 心输出量","E 搏出量","B 射血分数")
questions[25] = new Array("26.心肌的等长自身调节,是通过改变下面哪个因素来调节心脏泵血功能的","A 心肌初长度","B 心室舒张末期容积","C 心肌收缩能力","D 肌小节的长度","E 心交感神经对心脏的作用","C 心肌收缩能力")
questions[26] = new Array("27.心肌与骨骼肌细胞动作电位区别的主要特征在于","A 0期去极","B 1期复极","C 2期平台","D 3期复极","E 4期","C 2期平台")
questions[27] = new Array("28.心脏不会发生强直收缩的原因是","A 心脏是机能合胞体","B 心肌是横纹肌","C有神经、体液的调节","D 心肌有效不应期长","E 心肌的伸展性小","D 心肌有效不应期长")
questions[28] = new Array("29.心肌自律性高低取决于","A 0期去极化速度","B 3期复极化速度","C 4期自动去极化速度","D 动作电位的幅度","E 静息电位水平","C 4期自动去极化速度")
questions[29] = new Array("30.房室延搁的生理意义是","A 使心房、心室不会同时收缩","B 使心肌不会产生强直收缩","C 增强心室肌收缩力","D 使心室肌有效不应期延长","E 使心肌呈“全或无”收缩","A 使心房、心室不会同时收缩")
questions[30] = new Array("31.关于血压的叙述,哪项是正确的","A 指血液对血管壁的压力","B 平均动脉压是收缩压与舒张压的平均值","C 主动脉血压与心室内压波动幅度相同","D 其它因素不变时,�