内分泌系统 The Endocrine system
内 分 泌 系 统 The Endocrine System
分泌系统 一、概述 内分泌系统与神经系统是调节机体各种机能、维持內环境相对稳定的 两大信息传递系统。内分泌细胞产生的激素,不经过导管,直接经 体液传送至靶细胞,以调节其机能。 激素的传送方式:有直接经血液的远距分泌,弥歡至邻近细胞的 分借轴突的轴浆流动运送的神经分氵三种。 内分泌系统包括内分腺和分徵散存在机体各处的内分泌细胞
一、概述 内分泌系统与神经系统是调节机体各种机能、维持内环境相对稳定的 两大信息传递系统。内分泌细胞产生的激素，不经过导管，直接经 体液传送至靶细胞，以调节其机能。 激素的传送方式: 有直接经血液的远距离分泌，弥散至邻近细胞的 旁分泌和借轴突的轴浆流动运送的神经分泌三种。 内分泌系统包括内分泌腺和分散存在机体各处的内分泌细胞。 第八节 动物内分泌系统
Introduction Blood fiow Hormones are roduced by endocrine lands. Their products diffuse into capillaries and are carried throughout the body Gland 0 Q 0 Endocrine gland
Neurotransmitter Paracrine regulator FIGURE 53.2 The functions of organs are influenced by neural, autocrine, paracrine, and endocrine regulators. Each type of chemical regulator binds in a specific fashion to receptor proteins on the surface of or within the cells of target organs
Introduction Larval Brain All animals use chemical messengers prothoracic secretory to requlate cellular activity. These In Insects brain hormone With a high level messengers are controls the brain of juvenile hormones. Hormones hormone hormone. larval stages. occ are transported dyson through the body and bind to receptors of Ecdysone brings aboul Larval their target cells molt and Stages Insect brain hormone maturation stimulates a gland in the thorax that produces a steroid With a low hormone necessary level of juvenile for molting and hormone, maturation occurs Without uvenile OCCUTS Adult Insect