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...