Final answer:
A vasodilator that increases medullary flow will decrease sodium reabsorption.
Step-by-step explanation:
A vasodilator that increases medullary flow will decrease sodium reabsorption. When blood pressure is decreased by acting as a vasodilator, it leads to a decrease in sodium reabsorption in the kidneys. This is because the vasodilator increases glomerular filtration rate, resulting in less sodium being reabsorbed back into the blood.