单词	serotonin
释义	serotonin /ˌsɛrəˈtəʊnɪn / noun Biochemistry A compound present in blood platelets and serum, which constricts the blood vessels and acts as a neurotransmitter. Alternative name: 5-hydroxytryptamine; chemical formula: C10H12N2O. Tryptophan is an amino acid that serves as a precursor to the neurotransmitter serotonin.... These physiological changes decrease patients' pain thresholds and thereby increase pain sensation, anxiety, fear, and the release of pain transmitters, such as histamines, serotonins, kinins, and prostaglandins. These work by raising the levels of the chemicals serotonin and noradrenaline in the brain, which both tend to elevate the mood. Origin 1940s: from serum + tonic + -in1. Rhymes Cronin, phone-in, ronin
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