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Lecture 2 homeostasis

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 1
أستاذ المادة شهلاء خزعل عبد محمد جابك       20/02/2019 08:28:38
Characteristics of Control Systems There are some key features which are common to all control systems 1. Communication:In the body the main communication pathways are the nervous system and the endocrine system (hormones). Some hormones are released locally rather than into the blood and they act locally, which is known as paracrine control. A variety of agents can be released by cells which can have an effect on the releasing cell, and this is known as autocrine control. The peripheral nervous system can be divided into the afferent branch (signal direction towards the brain; sensory input) and the efferent branch (signal direction away from the brain; motor output).

2. Control centre:Two important control centers in the brain are the hypothalamus and the medulla oblongata in the brain stem. The hypothalamus is involved in the control of the endocrine system and the medulla are involved in the control of ventilation
and the cardiovascular system.

3. Receptor: In the body sensors are usually specialized nerve endings, such as chemoreceptor, thermoreceptors. Sensors communicate input to the control centre via afferent nerves. 4. Effecter: For example, in the body effectors could be sweat glands which are activated to produce more sweat which causes heat loss via evaporation.

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .