人的大脑接受来自身体各方面的信息,包括疼痛、温度、触压等基础感觉及听觉、视觉、位置觉、进食、尿便意识等,并能将这些信息进行综合分析,然后指挥相应器官行使不同的职能。如在进食后,口腔、咽、食道、胃等部位的感觉器通过神经将“进食”这一信息传到大脑,一方面引起“饱”的感觉,另一方面经过整合后,使胃液分泌增加,胃紧张性收缩和胃蠕动功能增强,而使胃逐渐排空。但是,如果人们的情绪处于紧张,焦虑、恐惧、愤怒及忧郁等状态时,大脑皮层由于其兴奋集中于情绪,对周围神经的感觉不敏感,而对周围神经的控制和调节能力下降,使胃肠道的分泌、运动功能紊乱,从而引起各种胃肠疾病。人在愤怒和紧张时,胃液分泌量大为增加,过量胃液中的胃酸破坏了胃黏膜屏障,直至黏膜引起损伤性病变。而人在恐惧或忧郁、思考时,能减少胃血流量,从而明显地抑制胃酸分泌,同时引起胃运动减弱。由于胃运动减弱,长期间停留在胃内食糜和胃液的混合液会对胃黏膜造成损伤。
(编辑:杨义伟 )
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