Which of the following would most likely be the result of a mutation in a person’s skin cells?
a. the person’s sex cells would also have mutations
b. the person would most likely have skin cancer
c. no change in the functioning of the skin cell

Na+ loss through sweet plus the dilution has lowered na+ concentration outside of neurons, altering the na+ equilibrium potential. sodium exists more outside the cells than inside. when na+ is lost by sweat plus the dilution( because they drink a lot of water) changes the concentration outside the cell, forcing the water to enter the cell and attempt to balance the concentration inside/outside.the problem is that the abundance of water will cause the cells to swell. most cells can adapt, however, the brain cells can't that's why the runner has confusion and can't control the muscles.  if not treated and this occurs in less than 48 hours, it can be immediately fatal .

Answer:   true.   note that "buproprion" is marketed as "zyban" when used for a smoking cessation aid;   and "wellbutrin" and "wellbutrin xl" (and generic equivalents) when used for depression   (and off-label usages).