第12题: [多项选择]心肌通过等长自身调节来调节心脏的泵血功能,其主要原因是 A. 心肌收缩能力增强 B. 肌节的初长度增加 C. 横桥联结的数目增多 D. 心室舒张末期容积增大 参考答案:A 答案解析:[解释] 前负荷和后负荷是影响心脏泵血的外在因素,而肌肉的内部功能状态也是决定肌肉收缩效果的重要因素。心肌不依赖于负荷而能改变其力学活动(包括收缩的强度和速度)的特性,称为心肌收缩能力(myocard
A. He is a 23-year-old former police officer. B. He is the Serb paramilitary leader. C. He is an accomplice of Serb paramilitary leader. D. He is a policeman at the spot. 参考答案:B 答案解析:抓住句子“The Yugoslav authorities have announced...,who was shot dead in Belgrade a week ago.”。