| 单词 | 心率 |
| 释义 | 〔norepinephrine〕A substance, C8H 11NO 3, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood. Also called noradrenalin 去甲肾上腺素：一种物质，C8H 11NO 3，是激素和交感神经冲动介导者，有强大的血管收缩作用和神经传导作用，会引起血压、心率和血糖含量的增高 也作 noradrenalin〔stress〕A mentally or emotionally disruptive or upsetting condition occurring in response to adverse external influences and capable of affecting physical health, usually characterized by increased heart rate, a rise in blood pressure, muscular tension, irritability, and depression.压力：由外界不利影响而导致的一种精神或感情上压抑或沮丧的状况，能影响身体健康，其特征通常表现为心率加快，血压升高，肌肉紧张，易怒及受压抑 |
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