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Kidney question: it only asked to describe 3 regions INVOLVED in the excretion of waste... and INVOLVED is anything in the entire kidney >< i put ureter > waste actually goes out of kidney as urine Renal artery > blood with nitrogenous crap goes into the kidney ready to be filtered... and...

oh i think i understand it now! i dont believe that it can be both! Ok like someone had previously said retardation is negative acceleration. And if anyone has done fitzpatrick questions... the solutions use R=mkv when it says "Retardation due to resistance"... and only R=kv when its just...