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机体为了适应生存的需要,经常保持内、外环境间的相对平衡。这种相对平衡状态是经过复杂的生理协调过程实现的。机体调节的基本形式有两方面,一是体液调节,另一是神经调节。体液调节主要是由特殊的化学物质来完成,如各种激素,其中脑垂体所产生的激素较多,对机体生长、发育等方面都有调节作用。在腺垂体部分已能分离出六种激素,其中生长激素含量较多,约占脑垂体重量4—10%。而生长激素的释放地受下丘脑——垂体系统的控制。根据近年来的研究,看到下丘脑借助垂体门静脉系统与脑垂体发生密切的联系,常把它们看作是一个单位,叫作下丘脑——垂体系统。从下丘脑的一些特殊神经元所发出的神经纤维,终止于门静脉血管壁上,这些神经元分泌几种神经激素,有的具有兴奋作用,叫作释放激素(RH),有的具有抑制作用则称为抑制激素
The body in order to meet the needs of survival, often maintain the relative balance between the external environment. This relative equilibrium is achieved through a complex physiological coordination process. The basic form of body regulation in two ways, one is body fluid regulation, and the other is neuromodulation. Body fluid regulation is mainly done by a special chemical substances, such as various hormones, of which the pituitary gland produces more hormones, the body growth, development and other aspects have a regulatory role. In the part of the pituitary gland has been isolated six hormones, including more growth hormone, accounting for about 4-10% pituitary weight. The release of growth hormone is controlled by the hypothalamic-pituitary system. According to recent studies, we can see that the hypothalamus is closely related to the pituitary gland through the pituitary portal vein system and often treats them as a unit called the hypothalamic-pituitary system. The nerve fibers emitted from some specific neurons in the hypothalamus terminate in the walls of the portal vein. These neurons secrete several neurohormones, some have an excitatory effect, called releasing hormone (RH), while others have an inhibitory effect Known as inhibiting hormone