Homeostasis
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Concentrating urine – the mammalian kidney
Interactive animation including quiz
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Diabetes 16+
Excellent interactive resource from Schoolscience.
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Endocrineweb
Collection of hormone info and links, including diabetes and pancreatic hormones (aimed at patients)
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Homeostasis tutorial
Animated tutorial on homeostasis – needs sound.
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How your kidneys work
Article from How Stuff Works including diagrams of nephron structure
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Kidney animation
From kscience website – has detail of processes in different sections of the nephron.