* If feed is high in protein then lots of urea is produced and the urine is more concentrated
* If feed is high in protein then lots of urea is produced and the urine is more concentrated
* If feed is low in protein then less urea is produced and the urine is less concentrated
* If feed is low in protein then less urea is produced and the urine is less concentrated
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==Revision==
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Use the [[Essential Ion and Compound Balance and Homeostasis - Renal Flash Cards - Anatomy & Physiology|flash card revision resource]] for this section to test yourself.