我們為何要接吻英語作文
People kiss for the simple reason that it feels good. Our lips are full of sensitive nerve endings, which activate sensory areas in the brain. Kissing boosts the levels of neurotransmitter substances such as dopamine, serotonin, and oxytocin. Dopamine triggers craving and desire, serotonin elevates a person’s mood, and oxytocin is involved in forming emotional attachments.
Besides humans, the only animals that scientists have ever seen kissing are our closest ape relatives, chimpanzees, and bonobos, and even then it is a rare occurrence. So scientist think there must be a better explanation for it.
Kiss and Tell
Some scientists have theorized that kissing might help us assess a partner’s immune system. When people kiss, they come close enough to sample the scent of each other’s bodies. And that scent may contain clues to immune system compatibility.
Parents with complementary immune systems have children with a stronger ability to resist disease. Children that are better at resisting disease are more likely to survive to have their own children. Evolution will favor those who choose partners with compatible immune systems over those who don’t, even if they don’t even know that they are doing it.
Exchanging saliva may provide other chemical clues to genetic compatibility too. So, kissing really is all about chemistry!
【我們為何要接吻英語作文】相關文章：
高中英語作文：我們為何要學英文08-10
普特英語聽力：為什么要接吻08-12
「感悟」我們為何迷茫10-06
人為何要糊涂經典散文09-03
為何我要選擇放棄高中10-26
我們要多與父母溝通交流的英語作文08-05
我為何而活英語作文12-21
清明節為何要插柳07-10
我們要理解生活作文05-22