人体阻抗不是纯电阻，主要由人体电阻决定。人体电阻也不是一个固定的数值。一般认为干燥的皮肤在低电压下具有相当高的电阻，约10万欧。当电压在500~1000伏时，人体电阻便下降为1000欧。表皮具有这样高的电阻是因为它没有毛细血管。手指某部位的皮肤还有角质层，角质层的电阻值更高，而不经常摩擦部位的皮肤的电阻值是最小的。皮肤电阻还同人体与带电体的接触面积及压力有关。当表皮受损暴露出真皮时，人体内因布满了输送盐溶液的血管而具有很低的电阻。
较详尽地分析了在不同状态下的人体电阻值，为各种条件下的安全电压值提供了依据。
After analysing the human body's resistance in detail, the secure current values were put forward, and the useful basis for secure voltage under various conditions was provided.
影响触电者触电时危险程度的因素有：电压电流、电流作用时间、电流通过人体的途径、人体电阻等；
The factors, which influence the dangerous degree of electric shock are:voltage, current, function time of current, path of current passing the human body, resistance of human body etc.
重要由于除颤器产生的波形由病人身体的电阻抗所决定，因此只有当电极放置于病人体表后方能开始对除颤器进行充电。
Important Since the waveform (duration and amplitude) from the defibrillator depends on patient impedance, defibrillator charging must only start after the electrodes have been placed on the patient.
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