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新编九年义务教育三年制初级中学教科书《生物》第二册在“激素调节”一章中，对激素及其在血液中的含量作了如下介绍：“激素是内分泌腺的腺细胞所分泌的、对身体有特殊作用的化学物质，它在血液中的含量极少，只有百分之几微克（l微克一1／I000毫克），但是对人体的新陈代谢
The new nine-year compulsory education three-year primary secondary school textbook “Biology” Volume II describes the hormones and their levels in the blood in the “hormonal regulation” chapter: “The hormone is secreted by the glandular cells of the endocrine gland. Chemicals that have special effects on the body contain very little in the blood, only a few micrograms (1 microgram to 1/1000 milligrams), but the metabolism of the human body