激素4-39
激素是由内分泌腺或内分泌细胞分泌的高效能生物活性物质,经血液或组织液传递而发挥其调节作用。被激素作用的细胞称为靶细胞。激素本身既不是营养物质,也不产生能量,它通过调节各种组织细胞的代谢活动来影响人体的生理活动。
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