无论是清晰的语言,还是辽亮的歌声;也无论是美味的品嚐或是饮食的咀嚼和吞咽,都离不开舌头。这是人人皆知的。但它在这些活动中,究竟起什么作用,为什么非它参加不可,就不一定是人人皆晓的了。在舌头的表面分布着无数肉眼看不清的卵圆形小体,这就是味觉的尖兵——味蕾(图)。生理学家告诉我们味蕾有两种怪脾气:第一它只能接收物质的化学刺激,也就是说让舌头嚐到味觉的物质必须是溶液或是能为唾液所溶解的东西;如果是坚硬的固体而口腔又很干燥,那就根本嚐不出滋味来。当不同味道的饮食通过化学刺激作用于味蕾之后,味蕾立即把刺激的兴奋波经过传入神经传到大脑,经过大脑的分析综合后,于是就产生了不同的味觉。当我们在空腹的时候,几乎全部味蕾都处 Whether it is a clear language or a vocal song, no matter if it is a delicious tasting or a chewing and swallowing diet, it is impossible to leave the tongue. This is everyone knows. But what role does it play in these activities? It is not necessarily clear to everyone because of why it cannot participate. On the surface of the tongue there are countless oval bodies that are invisible to the naked eye. This is the tip of the palate, taste buds (pictured). Physiologists tell us taste buds have two kinds of strange temper: First, it can only receive chemical stimulation of the substance, that is to say, the substance that makes the tongue taste the taste must be a solution or something that can be dissolved by saliva; if it is a hard solid If the mouth is very dry, it will not taste anything at all. When diets with different tastes act on the taste buds through chemical stimulation, the taste buds immediately send the excited excitation waves through the afferent nerves to the brain. After analyzing the brain synthesis, different taste sensations are produced. When we were fasting, almost all of our taste buds were