edf壹定发手机版 edf888壹定发手机官网,练听力,上edf壹定发手机网页版_一定发App【唯一授权官网】! 注册 登录
> 在线听力 > 有声读物 > 英语杂志 > edf壹定发手机版文摘 >  第753课

edf壹定发手机版文摘740 年龄与嗅觉和味觉的关系





Age, Taste And Smell

One of the more puzzling consequences of old age is a decreasing ability to appreciate the taste of a fine meal. Actually, the problem is not only a matter of taste. It also has to do with smell.

Combined Senses

When we eat something, we rely on a combined sense of taste and smell to experience flavor. The next time you’re eating fruit-flavored candy, try this. Grab a handful of candy, close your eyes, and pick one. While pinching your nose shut, pop the candy into your mouth.

Chances are you’ll taste the tart sweetness of the candy, but you won’t recognize a particular flavor. Now let go of your nose. Presto! The savory flavor of banana-grape fills your mouth.

Taste is a limited sense; the taste nerves in the mouth and tongue only detect combinations of sweet, sour, salty and bitter. Flavors, on the other hand, vary widely, numbering in the tens of thousands. When we experience these many flavors, we use our nose as much as our mouth.

Smell And Flavor

For example, when you chew a piece of candy, you inhale the candy’s chemicals through your mouth and exhale them through your nose. As they pass through the nose, the chemicals trigger receptors that send smell and flavor signals to the brain.

The body tends to break down in old age, and taste and flavor receptors are no exception. Although taste buds in the mouth tend to lose some sensitivity, it is the decrease in the number of active flavor receptors in the nose that make it more difficult for elderly diners to truly savor an exquisite meal.

内容来自 edf壹定发手机网页版_一定发App【唯一授权官网】网:/show-7643-431692-1.html

疯狂英语 英语语法 新概念英语 走遍美国 四级听力 英语音标 英语入门 发音 美语 四级 新东方 七年级 赖世雄 zero是什么意思


XML 地图 | Sitemap 地图