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大便一次排多少正常
更新时间: 2020-11-04 00:00:00  

大便一次排300g左右属于正常,排便次数和习惯因人不同,粪便的形成与食物无重要关系。排便反射是一个复杂的综合动作,它包括不随意的低级反射和随意的高级反射活动。通常直肠是空虚的。当粪便充满直肠刺激肠壁感受器,发出冲动传入腰骶部脊髓内的低级排便中枢,同时上传至大脑皮层而产生便意。

关键词: 大便 多少 正常

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