第一节概述一、内分泌系统的基本概念内分泌系统与神经系统紧密联系,相互作用,是调节机体各种功能,维持内环境相对稳定的两大信息传递系统。内分泌系统的信息传递者是内分泌细胞产生的化学物质—激素。激素经体液传送至其它细胞后发挥兴奋或抑制作用,以调节被作用细胞(靶细胞)的机能。内分泌细胞有的比较集中,形成腺体如甲状腺,肾上腺与腺垂体等;有的比较分散,如消化道粘膜中便存在不少分散的内分泌细胞。还有些细胞是兼有内分泌作用的细胞,如下丘脑的某些神经细 The first section overview First, the basic concept of the endocrine system The endocrine system and the nervous system are closely linked and interaction, is to regulate the body’s various functions, to maintain a relatively stable environment, the two major information delivery system. Endocrine system of information transmission is produced by endocrine cells - hormones. Hormones exert their excitatory or inhibitory effects upon body fluid delivery to other cells in order to regulate the functioning of the affected cells (target cells). Some endocrine cells are more concentrated, the formation of glands such as thyroid, adrenal and pituitary gland; some more dispersed, such as the digestive tract mucosa there are many scattered endocrine cells. Still other cells are both endocrine cells, such as the hypothalamus of some neurons