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This simple yet instructive system provides a highly visual demonstration of how the kidney processes blood, excreting waste while conserving water, using a semi-permeable membrane and simulated blood, which contains no biological components. Salt content can be tested before, during, and after the filtering. Slide smears can be made for microscopic study, allowing students to observe that the “red blood cells” of the simulated blood are not present in the urine. A safe, dramatic re-creation of blood filtration. Includes materials for 30 students, a teacher’s manual with copymasters of student activities.



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