基础医学英语教学课件：Unit 12 Homeostasis.ppt

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 1,2,Homeo,stasis,position,same,Metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting change,organism,nzm,organ,n,organic,nk,胰高血糖素,肝糖,thermo:,heat,hot,thermo,s,tat,thermo,plastic,adj.,热塑性的,n.,热塑性塑料,thermo,chemistry,热化学，热力学,thermo,barometer,温度计,thermo,regulation,温度调节,de,polarization,separate,divide,de,oxygenate v.,去氧,de,hydration n.,脱水,de,amination n.脱氨基,corticoid,=,corticosteroid,gluco,:,sugar,glyco,gluco,corticoid,glycogen,olysis,glycogen,esis,glyco,-:,sugar,b.,glycogen:,肝糖，糖原,c.,olysis,:analysis,d.,esis,:synthesis,Definition,1.What is homeostasis?,2.What does homeostasis in living organisms involve?,3.Why is homeostasis necessary?,Homeostasis Mechanism,1.What does homeostasis require organism to be able to do?,2.,cybernetics,.,3.,negative feedback loops,4.,positive feedback loops,Negative feedback,occurs when the result of a process influences the operation of the process itself in such a way as to reduce changes.Negative feedback tends to make a system,self-regulating,;it can produce,stability,and reduce the effect of fluctuations.Negative feedback loops where just the right amount of correction is applied in the most timely manner can be very stable,accurate,and responsive.,Positive feedback,is a process in which the effects of a small disturbance on a system can include an,increase,in the magnitude of the perturbation.,That is,A produces more of B which in turn produces more of A.,Homeostasis at the Cellular Level,1.Why do all organisms perform homeostasis at a,cellular level,?,2.Why do,single-celled,organisms have a more difficult homeostatic task than,multicellular,organisms?,3.Please explain the important role of,negative feedback loops,by using an example.,Blood Circulation in Homeostasis,1.What are the main functions of the,circulatory system,in homeostasis?,2.The levels of substances within the blood are under control of other organs.,The respiratory system and the nervous system _,The liver and the pancreas_,The kidneys_,The endocrine glands_,The hypothalamus_,metabolite,metblat,n.代谢物,metabolism,mtblzm,n.新陈代谢,metabolic,metblk,a.,metabolize,mtblaz,vt.,Blood Circulation in Homeostasis,1.What are the main functions of the,circulatory system,in homeostasis?,2.The levels of substances within the blood are under control of other organs.,The respiratory system and the nervous system _,The liver and the pancreas_,The kidneys_,The endocrine glands_,The hypothalamus_,Maintenance of Blood Glucose Levels,1.What is the,most complicated,homeostatic system known?,2.What,hormones,control blood glucose levels?,3.What hormones stimulate,glycogenolysis,and,glycogenesis,respectively?,Oral Presentation,Use at least two examples to illustrate“,homeostasis,”.,Use ppt.and present it next time.,