1.What is the role of the renal system in regulating potassium ion concentration in the extracellular fluid [ECF]? a. Kidneys filter and excrete excess potassium ions into the urine. b. Kidneys respond to aldosterone by not excreting any potassium ions into the urine. c. Kidneys reabsorb all potassium ions into the urine. d. Kidneys excrete water molecules through aquaporins in the collecting duct.

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