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一岁两个月多少大便
更新时间: 2020-11-04 00:00:00  

一岁两个月,一天排便次数为3~5次是正常状态,这段期间要注意身体营养补充,防止便秘。

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。如环境许可,大脑皮层即发出冲动使排便中枢兴奋增强,产生排便反射,使乙状结肠和直肠收缩,肛门括约肌舒张,同时还须有意识地先行深吸气,声门关闭,增加胸腔压力,隔肌下降、腹肌收缩,增加腹内压力,促进粪便排出体外。

关键词: 多少 大便

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