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健康

List 症狀 – 恶

恶心是一种令人不快的呕吐冲动,是由延髓呕吐中枢传入的植物性冲动(包括副交感神经紧张度增强)引起的。呕吐是由于胃底下降、食管括约肌松弛时腹壁肌肉无意识收缩,导致胃内容物被强制排出。
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