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Serotonin is a chemical your body makes. Nerve cells use it to pass messages, especially in the brain, and a lot of it also works in the gut. Many people call it the happy chemical, because when the amount is in a good range you often feel steadier and more at ease. Though actually, that picture is tidier than the truth: serotonin does many jobs, and feeling happy is never only one chemical. Doctors talk about it because some medicines for low mood change how the body uses serotonin. It is a science word. You will meet it in health class, in the news, and on the side of some medicine boxes.
血清素（台灣常用名；較學術的說法是 5-羥色胺）
組成sero- (from serum, the watery part of blood) + tone (here, the tightness of blood vessels) + -in (a name ending for chemicals). It was named that way because scientists first knew it for changing the tone of blood vessels.
同家族的字
- serumthe sero- in this name comes from serum, the clear part of blood
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
serotoninnoun/ˌsɛɹəˈtəʊnɪn/
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biochemistrybiologychemistryAn indoleamine neurotransmitter, 5-hydroxytryptamine, that is involved in depression, appetite, etc., and is crucial in maintaining a sense of well-being, security, etc.
- Notably, mouse lines targeting genes codifying for serotonin receptors, for enzymes involved in 5-HT synthesis as Tph1 and Tph2, in its metabolism as monoaminoxidase A (MAOA) or in its re-uptake as serotonin transporter (SERT), have been generated.
- The class of antidepressants most commonly associated with sexual dysfunction is selective serotonin reuptake inhibitors, or SSRIs, which treat depression by ultimately increasing levels of the neurotransmitter serotonin in the brain.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。