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1、实验Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 实验原理分析：本实验采用对比实验的方法，通过向自 来水、缓冲液、生物材料中加入酸或碱溶液 引起的pH不同变化，定性说明人体内液体环 境
2、与缓冲液相似而不同于自来水，从而说明 生物体pH相对稳定的机制。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Creat
3、ed with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.方法步骤生物材料1和2的pH均保持相对稳定缓冲液的pH均保持相对稳定pH逐渐减小pH逐渐增大Evaluation only.Evaluation only. Created with Aspose.Slides fo
4、r .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.讨论（ P10 ） 1. 更像缓冲液。 2.缓冲液加入少量酸碱后，pH变化不明显。 原因是磷酸缓冲液中含有NaH2PO4/Na2HPO4， 其中NaH2PO4溶液呈酸性，当加入少量 NaOH时，可以中和OH-；Na2HPO4溶液呈碱性 ，当加入少量HCl时，可以中
5、和H+。 水溶液则不同，因而加入酸碱后，pH变化 明显。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.生物材料中含有缓冲物质Na2HPO4NaH2PO4H2CO3NaHCO3（一种弱酸和
6、相应的一种强碱盐组成）正常人血液中的PH通常为7.357.45间， 变化范围很小！Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.细胞消 化 系 统 碳酸钠组织液乳酸血浆中 缓冲物质H2C
7、O3NaHCO3乳酸C02H2O碳酸钠泌尿系统 排出Na2HPO4NaH2PO4 食物中的 碱性物质 如碳酸钠 NaHCO3H2CO3乳酸钠+呼吸系统 排出C02Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.
