Question

describe the effects of Aldosterone and ADH on urine volume and Potassium concentration when, neither are preset, both are present, Aldosterone only, ADH only

possible responses

Large Volume Dec [K]

Dec Volume Inc Conc

Slight decrease in V and increase in [K]

Decrease in V Increase in [K]

Answer 1

Aldosterone is secreted by the adrenal cortex. Aldosterone acts on the renal tubule to increase reabsorption of sodium and increase excretion of potassium in the urine. The water is also retained along with the reabsorption of sodium.
ADH is antidiuretic and increases retention of water. This results in production of concentrated urine and low urine output.
So when neither aldosterone nor ADH are present it results in production of large volume of urine and decreased potassium excretion in urine.
When both aldosterone and ADH are present it results in production of concentrated urine and low volume of urine. Potassium excretion in the urine increases.
When only aldosterone is present it results in slight reduction of urine volume and increased excretion of potassium in urine.
When only ADH is present it results in low volume of urine which is more concentrated.