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人或动物的各种活动,都是通过神经或激素传递讯息而进行的。如果说,神经有点象电报,两端间有线路(神经纤维)相通;激素却象无线电,产生激素的细胞将讯号置入循环血流中,顺流到达靶细胞(效应细胞)。数十种不同激素同时在血流中传讯,靶细胞必须有高度选择性的接收讯号装置,才能接受激素的讯号而产生效应。垂体前叶是产生激素的一种重要腺体。人的垂体前叶只有豌豆样大小,产生的激素却控制人体的生长发育、生殖、代谢等。这些激素包括生长素(GH)、促皮质素(ACTH)、促甲状腺素(TSH)、促黄体素(LH)、促卵泡素(FSH)、催乳素(PRL)、促黑细胞素
A variety of human or animal activities are carried out through neural or hormonal messages. If, say, the nerve is a little telegram, there is a line (nerve fiber) between the two ends; hormones, like radio, hormone-producing cells put the signal into the circulating bloodstream and down stream to the target cells (effector cells). Dozens of different hormones communicate in the bloodstream at the same time, and target cells must have a highly selective signal-receiving device that accepts signals from hormones. The anterior pituitary gland is an important gland that produces hormones. Only the anterior pituitary of pea-like human size, hormone production but control the body’s growth and development, reproduction, metabolism. These hormones include growth hormone (GH), corticotropin (ACTH), thyrotropin (TSH), LH, FSH, PRL,