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82问答网 > 低钾血症和高钾血症时其静音电位和动作电位有什么变化?为什么？

低钾血症和高钾血症时其静音电位和动作电位有什么变化?为什么？

2025-03-25 21:42:05

推荐回答（1个）

回答1：

相同：骨骼肌兴奋性降低。
不同：低钾血症时出现超极化阻滞：即血清钾↓→细胞内外浓度差↑→静息电位负值增大→与阈电位差距增大→兴奋性降低。
严重高钾血症时出现除极化阻滞，即血清钾↑→细胞内外[K+]比值↓→静息电位太小（负值小）→钠通道失活→动作电位形成障碍→兴奋性降低。

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