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85问答库 > 剧烈运动大量出汗及时补水后尿量有何变化？为什么

剧烈运动大量出汗及时补水后尿量有何变化？为什么

2025-04-07 06:31:32

推荐回答（2个）

回答1：

汗液是低渗性液体，大量出汗引起血浆渗透压增高，刺激下丘脑晶体渗透压感受器兴奋，引起下丘脑—神经垂体系统合成释放ADH增多，远曲小管和集合管对H2O的重吸收增加，尿量减少。
大量出汗使机体有效循环血量减少，引起心房和大静脉处容量感受器刺激减弱，使下丘脑—神经垂体系统合成释放ADH增多，肾小管对H2O重吸收增加，尿量减少；肾内入球小动脉内血流量减少，对入球小动脉壁的牵张刺激减弱，激活了牵张感受器，使肾素释放增加。

回答2：

运动淌汗后会导致小便发红吗

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