激素是由人或动物的内分泌器官分泌的一种化学物质,具有生物活性。它们随血液循环于全身,并对特定的组织(称为靶组织)或细胞(称为靶细胞)发挥特有的生理作用,是协调人或动物体内新陈代谢作用的化学信使。激素的分泌量很少,但其调节作用却极明显。激素与靶细胞上的“激素受体”结合后,能使激素信号传递并转化成一系列细胞内的化学反 Hormone is a chemical secreted by human or animal endocrine organs and has biological activity. They circulate throughout the bloodstream and exert specific physiological actions on specific tissues (called target tissues) or cells (called target cells), which are chemical messengers that coordinate the metabolism in humans or animals. Hormonal secretion is small, but its regulatory role is very obvious. Hormone and target cells on the “hormone receptor” after the combination, the hormone signal can be transmitted and converted into a series of intracellular chemical anti-