A Complete Collection of 100000 Whys
Fav十万个为什么
为什么麻醉后感觉不到疼痛？
麻醉通过抑制中枢神经系统、阻断神经信号传递以及降低大脑兴奋性，使人体无法感知疼痛。
1、麻醉药物作用于中枢神经系统，抑制神经元活动，降低脑细胞的兴奋性，从而阻止疼痛信号传递。
2、麻醉药物干扰神经递质的释放或接收，阻断突触间的信号传递，使大脑无法接收和处理疼痛信息。
3、全身麻醉通过多种药物让患者进入类似睡眠状态，抑制意识、感觉和运动功能，从而消除疼痛感。
4、局部麻醉通过阻断特定区域的神经信号传递，使该区域失去痛觉，但保持意识清醒。
5、麻醉药物作用是暂时且可逆的，当药物被代谢或排出后，神经系统功能恢复正常，疼痛感也随之恢复。
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