I wish I could put to words my frustration that my long, drawn out post didn't show up when I posted it yesterday.
Here are the cliff notes:
Aldosterone increases Na+ reabsorption and K+ secretion. The hypernatremia is not a result of a change in plasma tonicity. What actually happens is that the Na+ reabsorption causes osmolality receptors to send signals to release ADH(the real hormone in charge of osmoregulation) and this allows water to follow the reabsorbed Na+ passively out of the collecting duct in to the plasma.
Thank you all for the well-written help, especially Physics. I have a very good understanding of it now, but my original question is a little bit murky still.
A lot of aldosterone would give you hyperaldosteronism so yes.True of false: aldosteronism results in hyperaldosteronism.
True or false: aldosterone only resorbs Na+, no water follows via osmosis
For your original question: the final result is that when the aldosterone is released the fluid reabsorbed from the kidney is isotonic to blood.
since this is a physio topic I have a question.
I have BRS physio second edition..is the third edition better? maybe more graphics?