How can the hormone adrenaline that does not act directly on the brain have a regulatory effect on brain function?

肾上腺素不直接作用于大脑，怎么会对大脑功能产生调节作用呢？

youdao

Alcohol acts quickly on the brain.

酒精对大脑迅速产生影响。

《牛津词典》

He has sex on the brain.

他脑子里想的全是性。

《牛津词典》

For example, a person who speaks and reads fifteen languages, or a medical doctor who operates on the brain.

VOA: special.2010.06.27

The first is they're topographical and what this means is that if two parts of the— two parts are close together on the body, they'll be close together on the brain.

首先它们是具有地形学特点的,这意味着,如果身体上的两个部位是紧挨着的话,那它们在大脑中对应的区域也是紧挨着的

耶鲁公开课 - 心理学导论课程节选

Well, the claim that language is part of human nature is supported by neurological studies, some of which were referred to in the chapters on the brain that you read earlier that talk about dedicated parts of the brain that work for language.

语言是人类本性的一部分的这个观点,得到了神经研究的支持,在之前大家阅读的关于大脑的章节中,对专门负责语言功能脑区的探讨,就描述了其中的一些研究

耶鲁公开课 - 心理学导论课程节选

"Stress hormones act on the brain to remodel it and change it, " McEwen said.

FORBES: Stress Can Shrink Your Brain

One large area of research is in plaques of beta amyloid which form on the brain.

BBC: Bad sleep may predict Alzheimer's, says study

It is believed that this may contribute to the excess water on the brain.

CNN: Study: Major benefits for spina bifida surgery in the womb