SAT阅读素材：Dopamine and Learning.

　　SAT阅读除了检测考生的词汇量外，还要考察考生的理解及判断的综合能力。下面澳际小编为大家整理一篇关于Dopamine and Learning的SAT阅读素材文章，供大家学习，大家平时也可以多关注和积累，自己搜集整理一些比较好的SAT阅读考试素材，帮助自己更好地备考SAT阅读考试。以下是详细内容。

　　每一篇SAT阅读素材均有其主要观点或中心主题。典型的围绕文章主要观点的问题大多是：在这篇文章中作者的主要目的是什么?这篇文章主要涉及什么问题?这篇文章主要建议是什么?这篇文章总体上想要回答什么问题等。读完每一篇SAT阅读素材，我们都要针对SAT素材想想这几个问题。

　　Dopamine and Learning

　　Dopamine is a catecholamine neurotransmitter present in a wide variety of animals, including both vertebrates and invertebrates. In the brain, this phenethylamine functions as a neurotransmitter, activating the five types of dopamine receptors—D1, D2, D3, D4, and D5—and their variants. Dopamine is produced in several areas of the brain, including the substantia nigra and the ventral tegmental area. Dopamine is also a neurohormone released by the hypothalamus. Its main function as a hormone is to inhibit the release of prolactin from the anterior lobe of the pituitary.

　　Dopamine is available as an intravenous medication acting on the sympathetic nervous system, producing fects such as increased heart rate and blood pressure. However, because dopamine cannot cross the blood-brain barrier, dopamine given as a drug does not directly affect the central nervous system. To increase the amount of dopamine in the brains of patients with diseases such as Parkinson&aposs disease and dopa-responsive dystonia, L-DOPA, which is the precursor of dopamine, can be given because it can cross the blood-brain barrier.

　　通过对上面的这篇SAT阅读素材的介绍，大家可以把重点放在词汇的扩充和文章叙述习惯的了解上。报纸的文章是最贴近美国学术类英语描述顺序的，大家可以根据这些内容进行广泛的积累和借鉴。

　　SAT阅读考题重点考察考生的美国大学教材的快速阅读能力、理解能力及判断能力。以上就是澳际小编为大家整理的关于Dopamine and Learning的SAT阅读素材的详细内容，希望对大家有所帮助，澳际小编祝大家都能取得理想的SAT阅读考试成绩!