推荐回答（1个）
一个人发怒时真的会“怒发冲冠”，恐惧时真的会“全身血液都凝固”吗？是否真的爱情使人盲目，害怕让人面无血色？这些俗语里究竟隐藏着人体怎样的秘密，是否有科学依据、符合事实呢？看了下面的小文章，您就会明白了。一、“心跳到了嗓子眼里”如果人受到极度惊吓、恐惧或者陷入热恋，体内就会释放肾上腺素和去甲肾上腺素，导致心跳加快、加强。此时大脑要靠颈动脉供血，所以颈动脉的搏动会更有力，于是人们就会产生“心跳到了嗓子眼里”的感觉。二、“全身血液都凝固了”这句话和极地的天寒地冻可一点关系也没有，它指的是血管里的血液不流动、似乎凝固住的感觉。当人们受到极度恐惧或惊吓时，身体处于极大的压力和紧张中，血液里的纤维蛋白会增多，使血液变得粘稠、流动缓慢。于是人们才会产生“全身血液都凝固”的感觉。 三、“爱情使人盲目” 俗话说“情人眼里出西施”，坠入爱河的人往往变得热情而盲目，以至于时常做出错误的判断。这是为什么呢？原来由于端脑不能把接收的信息和之前已有的经验深入地比较、衡量，所以大脑皮层对于眼睛接收的美好事物往往做出积极的反应。所以“盲目”也不是全部的，而是有选择性的。四、“怒发冲冠”大家都知道，人冷的时候身上会起鸡皮疙瘩，汗毛耸立。而动物（比如猫）遇到敌人时出于害怕或者愤怒也会竖起毛。两者是一种防御的本能。 五、“吓得面色苍白”当人受到极度惊吓或害怕时，往往面无血色——这是肾上腺素分泌增多的缘故。当人们情绪激动、热血沸腾时，体内会分泌大量肾上腺素，刺激血液回流到体内重要器官里，以正常保证供血，所以这时肤色会显得苍白。
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