What effect does aldosterone have on sodium ion concentration in the ECF?
A) Aldosterone increases urinary sodium retention and therefore decreases sodium ion concentration in ECF.
B) Aldosterone decreases urinary sodium retention and therefore increases sodium ion concentration in ECF.
C) Aldosterone decreases urinary sodium retention and therefore decreases sodium ion concentration in the ECF.
D) Aldosterone does not affect urinary sodium retention and therefore has no effect on sodium ion concentration in ECF.
E) Aldosterone increases urinary sodium retention and therefore increases sodium ion concentration in ECF.
Answer: E
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