推荐回答（1个）
香蕉的功效： 香蕉在人体内能帮助大脑制造一种化学成分——血清素，这种物质能刺激神经系统，给人带来欢乐、平静及瞌睡的信号，甚至还有镇痛的效应。因此，香蕉又被称为“快乐食品”。美国医学专家研究发现，常吃香蕉可防止高血压，因为香蕉可提供较多的能降低血压的钾离子，有抵制钠离子升压及损坏血管的作用。他们还认为，人如缺乏钾元素，就会发生头晕、全身无力和心率失常。又因香蕉中含有多种营养物质，而含钠量低，且不含胆固醇，食后既能供给人体各种营养素，又不会使人发胖。因此，常食香蕉不仅有益于大脑，预防神经疲劳，还有润肺止咳、防止便秘的作用。 香蕉作用： 香蕉味甘性寒，具有较高的药用价值。主要功用是清肠胃，治便秘，并有清热润肺、止烦渴、填精髓、解酒毒等功效。由于香蕉性寒，故脾胃虚寒、胃痛、腹泻者应少食，胃酸过多者最好不吃。 【药理作用】 果肉中含去甲肾上腺素、5-羟色胺及二羟基苯乙胺甚多，日本所产者，含5-羟色胺在10～15微克/克据测定，乌干达所产之香蕉中去甲肾上腺素含量为2微克/克，5-羟色胺为16.2微克/克。 每日食入5-羟色胺10毫克对胃肠功能并无障碍，但如食入过多，可能导致胃肠功能障碍。 在测定尿中吲哚或儿茶酚胺时，不应吃香蕉。 未成熟的香蕉肉对豚鼠的保泰松诱发性胃溃疡，有预防(同时服用)或治疗(服保泰松后15天再服香蕉肉)作用;对强制性不动所诱发的大鼠胃溃疡也有保护作用，但对强的松诱发者则无效。 这种保护作用可能是由于其中所含的5-羟色胺使胃酸降低，以及香蕉肉缓和刺激的原故，它无抗胆碱作用，也无中枢抑制作用。 芭蕉树叶及茎干的液汁(含5-羟色胺，但不含Dopa或去甲肾上腺素)能收缩离体豚鼠回肠及大鼠十二指肠，并升高犬及大鼠的血压，这些作用可被阿托品及妥拉唑啉所拮抗。 干叶、茎之甲醇提取物有抑菌作用;成熟香蕉之果肉甲醇提取物的水溶性部分有抑制真菌、细菌的作用。
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