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1，生物题排尿对人体来说有哪些重要意义

排除废物

生物题排尿对人体来说有哪些重要意义

2，尿尿有什么好处

小便是排脂肪的啊

尿尿有什么好处

3，人为什么要小便

昨天看中央2套健康医学上说是为了排毒

人为什么要小便

4，人为什么要小便

你是不是没有啊
因为要大便所以要小便

5，排尿为什么可以维持组织细胞的正常生理功能

排出代谢产物,帮助保持水盐平衡,使人体内环境保持动态平衡.
人体在维持生存，就要有新陈代谢，也就是吐故纳新。人们每个摄入的食物当中有不少有害成份，这些有害成份和营养成份一起被肠道吸收，进入肠系膜静脉，肠系膜静脉汇总到门静脉进入肝脏，对各种成份进行加工处理，通过肝细胞当中各种酶的作用将营养成份进一步裂解成人体细胞可以吸收利用的小分子，在这个过程中又会产生一些有害裂解产物。这些有害物质如果输送到人体各个细胞，对这此细胞是有害的。因此，必须有一个清除机制，这就是肾脏。肾脏就像两个大筛子，不停地往排出有害小分子物质，同时又不能让血细胞和血中的营养物质流失。通过肾脏的筛眼出来的物质除了有害物质还有水，肾的远端小管又把他们吸收回去再利用，这样，筛出的初尿就逐渐浓缩成了尿液。如果肾功能损伤，无法向外排出有害物质，这些有害物质就会在体内堆积起来，毒害全身的细胞，这就是尿毒症。尿毒症病人必须每隔一段时间，一周两三次吧，通过血液透析机把血液中的有毒物质过滤出去，他们才能活下来。　　排尿是为了排掉多余的水，尿素，多余的钙和磷，以及各种被肾过滤的毒素，比如农药残余物。其中尿素是最主要的，人和植物不一样，没有氨基酸库，不能储存作为能源之用的蛋白质或氨基酸。蛋白质经消化吸收后，除了供生长之外，多余的蛋白质必须放也氨基然后转化为糖原或脂肪进行储存，这个过程必须放出氨基，也就是放出含氮废物，这些含氮废物经肝等器官转化成尿素后经肾过滤，溶于水后排出就形成尿。也不是所有的动物都要排尿，有些爬行动物为了节水，就把含氮废物加功成不溶于水的尿酸排出，人要是产生尿酸就会引发肾结石。

6，生物急求排泄的意义

简单说就是能促进新陈代谢，排除代谢废物和对个体有毒的物质。
生物代谢产生的废物必须排出体外，否则将破坏内环境的稳定，导致中毒。如人患肾炎，排尿发生障碍，就出现尿中毒的症状。 排泄的对象是细胞代谢废物，排泄过程一般都是耗能的。是由排泄器官完成的，人体过量的Ca2+和Fe2+是随粪便排出的，而这些离子以及细胞一些分泌物都是细胞代谢过程产生的，严格地说，这应属排泄而不是排遗。同理，肺排出CO2，肝排除胆汁，也都应属于排泄。排泄 排泄的过程同时也是保持体液稳定的过程。饭菜咸了要多喝水，结果尿多，而排尿的结果既排除了过多的水，也排除了过多的盐。 动物的代谢废物主要是细胞呼吸产生的CO2和蛋白质等分子分解产生的含氮废物，如NH3、尿素、尿酸等。呼吸系统负责排出CO2。排泄系统则是排除含氮废物。 在于大多哺乳类来说，它们经两种主要的途径进行排泄作用。其之一为肾脏产生尿液(见泌尿系统)，经排尿作用排出体外；另外一种为呼吸作用所产生的二氧化碳，经肺部呼出体外。 排尿作用受激素抗利尿激素所控制，此激素能增加远曲小管重吸收水的能力，并透过改变其自身浓度来控制排尿量，它是由脑小丘制造，并于脑下垂体储存及分泌。 排汗是另一种排泄作用，它可以排走水分及盐，但其实这个机制的主要目的是降温。狗只并没有皮肤排排泄汗机制。 人类的主要排泄器官是肾以及辅助的泌尿器－用以排出尿液；以及大肠－用以排出固体的废物。 皮肤及肺部皆有排泄的功能：皮肤以流汗的方式排走水分及盐，肺部则排出水蒸气及二氧化碳。其中二氧化碳为人体最主要的代谢废物。
research purposescommunity health service as the base of urban health care system in china is the mostimportant access to enhance the implementation of reform on the urban system. communityhealth service in china has developed remarkably under the promotion of central governmentsince 1997, but the quality and speed of its development is still much more below than theexpectation of the society. one reason which could be applied to explore it is that there havebeen still some uncertainties concerning its key policy issues on systematical framework oncommunity health service organizations. or the problem could be concluded as whom among theprivate or public organizations can provide community health service much better concerningfunction, quality, respect to community public benefit, and efficiency? could the private sectorsplay a leading role in promoting community service development in china?just as the new health reform has started recently in china, to find the essential charactersof...更多 private community health service organizations through a well-designed comprehensive andsystematic study, which is based on its performance to public well-being, would facilitate policyimprovement and implementation on community health service development in china.this study on private community health service organizations in the key 28 cities selectedby the ministry of health is an in-depth analysis. it includes the basic infrastructure, equipment,policy implementation, financial revenues and expenditures, human resources, service provisionand relative efficiency of service provision compared to community health service agencies runby public or enterprises. except comparing according to the distribution of private communityhealth agencies in eastern, central and western part of china which is aimed to explore thedifference in development process across region, some in-depth interviews with experts,government officers, health professionals, individuals who run private community healthorganization as well as community residents and field investigation to some private communityhealth service organizations have also been carried out. it is great significance that the currentdevelopment status of private community service organizations in china and its essential characters have emerged through the research which would provides a solid foundation in theoryand methodology for formulating relevant policies for the future development of communityhealth service in china.research methodsin this study, the literature review, field investigation, experts discussion, the descriptiveanalysis and hypothesis testing methods were used. in data analysis and processing, we haveused statistical description, chi-square test and dea methods.research contentsfor evaluation on the development status of private community health serviceorganizations, this study has focused on important aspect of all community health serviceorganizations in the key 28 cities. it included: (1) infrastructures status and implementation ofrelevant policies of the investigated private community health service organizations, in order toexplore the internal and external environment; (2) the financial revenues and expenditures:including revenues, expenditures and the balance of payments; (3) human resources: thecomposition of qualifications, titles, professions and personnel training; (4)service provision:mainly included prevention, health care, medical care, family planning, rehabilitation, andhealth education.; (5) the relative efficiency of services: mainly focused on the key cities.research resultsthe study has shown that private community health service organizations had some effecton making up for the lack of health resources, promoting the establishment of communityhealth services organizations, facilitating patients to get medical treatment at community as wellas had some influence on reform of public community health service facilities. the study hasalso shown some challenges to private community health service organizations: (1) it isdifficult for it to make clinical decision primarily according to the benefit of client, for instance,induced utilization on drugs and mainline are too often to be observed; (2) it is hard for it toimplement qualified public health intervenes due to difference on quantity of compensation frompublic finance; (3) it is hard sometime for it to provide equal qualified service infrastructure for its clients compared to other communities in the same city; (4) sometime it is too often of aprivate community health service agency closes its operation in a community due to transfer itsfund to other issue. (5) it is not unusual that the internal management is poor and not wellregulated in some private community health service organizations, for instance, though theservice efficiency of the private community health service centers in 77.78 percent of the keycities are dea effective relatively, while the private community health service stations weredea effective relatively in only 22.73 percent of the key cities; (6) there are some weakness onexterior surveillance as well as in policy implementation which is designed to help the service.people can easily make their own judgment on the essential character of private communityhealth service organizations at current period in china due to the information provided by theresearch.policy suggestionsin view of the evaluation results, this study proposed the following policyrecommendations: (1) community health service organizations run by public should play theleading role in community health development in china in order to protect the benefit of publiceven from the systematical framework aspect. (2) the government should strengthensupervision and management for private community health service organizations; (3) privatecommunity health service organizations should focus on improvement of its internalmanagement, especially focused on quality of medical care services as well as honesty to itsclient; (4)the government should direct and help private community health service organizationsin providing public health and medical care service properly, especially through implementingrelevant policy supporting that includes policy of finance, policy of price control, policy ofrevenue, policy of social medical insurance, policy of health service administration, etc. (5)the government should pay much more attention on promoting the development of the wholecommunity health service system in the country, especially helping the central and western partof china, enhancing the reform of operational mechanism as well as improving training forcommunity health professionals. the innovation of the study1. we conducted a comprehensive, systematic, objective and in-depth research about thedevelopment of pchs institutions for the first time.2. we compared pchs and the chs that belong to government or the affiliated medicalinstitutions and enterprises firstly, in order to disclose the main strengths and weaknesses ofpchs.the limitations and the further study suggestions1. as a result of restrictions on raw data, we failed to conduct the analysis about thecommunity health service quality and user satisfaction, which will be the subject of researchfocus of the next step.2. due to the shorter time span of the database, we could not make a vertical comparison bydifferent years

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