Homeostasis - kidneys
The kidneys and water balance is a nice topic to teach. Students have direct experience of the process and can observe changes depending on their own water intake. It is satisfying when students understand processes so directly related to their own physiology.
Part of the topic deals with kidney dialysis and transplants. Care should be taken in this area as some sensitive issues are touched upon. It is not beyond possibility that some class members may have direct experience through a family member or friend. Likewise, fatal accidents can often be the source of donor kidneys and this should be remembered.
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