excretion+in+humans

This sequence of videos shows a lesson in the renal system

This is a good video showing action of the Nephron, although the language is rather complex. media type="youtube" key="glu0dzK4dbU&hl=en&fs=1" height="344"

urine testing

=Kidney Dissection= media type="youtube" key="frvYjez6IUM&hl=en&fs=1" height="344"

Remember you need to understand the terms Ureter, Medulla and Cortex