- Apr 24, 2006
ADH is responsible for increasing the permeablity of the collecting ducts of the nephron in absorbing water..so ADH increases for surephoebe2007 said:also i'm pretty sure with 14 it's A... i origionally had C until i changed it.. and there are lots of different answers here.. BUT i think a because if he had a low blood pressure then both would be released and aldosterone is only to either raise the blood pressure or rasie the salt ions in the body.. and the question is not asking for any of that it is simply saying the marathon runner is dehydrated- meaning the cells do not have enough water, the water balance is out. This would mean there is already too much salt.. so no more salt is needed.
thats my take...
aldosterone increases the reabsorption of salts, hwoever, salts as in the absoroption of sodium ions and getting rid of potassium, and sodium ions is responsible for water retention. so if he was to dehydrate, he would need to have an increase in aldosterone to retain the water he currently has and increase water concentrations with more adh, so they work hand in hand, also addisons disease is the disruption of the adrenal cortex, which means not enough aldosterone is produced and a consequence of the addisons disease is severe dehydration so.... yeah thast what i believe