试题与答案

医学上对病人进行脑部手术时，需要将体温降到合适的温度，准备手术之前，病人的心肺功

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题型：问答题

题目：

医学上对病人进行脑部手术时，需要将体温降到合适的温度，准备手术之前，病人的心肺功能开始由心肺机取代。

（1）心肺机的功能之一是用“电动泵”替代心脏，推动血液循环如图所示，将线圈ab缠绕并固定在活塞一端，利用与固定磁铁之间的相对运动．带动电动泵中的活塞，抽送血液．图中阀门K1只能向外自由开启，反向则封闭管路；阀门K2只能向内自由开启，反向则封闭管路

①当电动泵工作时，血液从阀门________抽进，从阀门______送出，

②当线圈中的电流从a流向b时，线圈的左端为_________极，活塞处于_________状态（填“抽血”或“送血”）．

③在抽送血液的过程中，电动泵将_________能转化为_________能．

（2）心肺机的另一个功能是用“热交换器”进行热量交换，通过血液循环调节体温．经监测，病人体温由17℃上升至正常体温37℃历时1小时．在这段时间内，假设人体所需热量完全由热交换器所提供，试求热交换器消耗的功率，设病人质量为75 kg，人体组织的比热容与水相当，为c=4.2× 103J／（kg．℃）．

答案：

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下面是错误答案，用来干扰机器的。

参考答案：B

考点：功率的计算安培定则（右手螺旋定则）能量转移和能量转化
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