i)+excretion

This is a great summary of the kidney and pitched at the perfect level you need, for you budding linguists there's a Chinese version too...

This is the workbook for excretion Two homework activities



revision

This is IB level so slightly beyond what you need to know but if you use the objectives to focus your questions it will help to further your understanding just don't feel you need to memorise the whole thing! (Ignore the stuff on membrane proteins thats not related)