High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure. which would most likely occur in the kidney?

more water would be transferred from the nephron.
less water would be absorbed into the nephron.
the amount of water in the bladder would decrease.
the amount of water in the blood would increase.

More water will be transferred from the nephron

The excretory system is the system in the organisms body which allows the excretion of unwanted waste metabolites from the body like nitrogenous wastes like ammonia, salts and excess of water. Water is the chief ingredient of blood it decreases the viscosity of blood and prevents it's clotting.

In the case of hypertension or high blood pressure the excretory system plays an important role by expelling more amount of water out of the body. Therefore, more amount of water will be transferred from the nephron to the urinary bladder.  It is an internal control of the body. It increases the urge to urinate to expel the water and preventing the ill effects of high blood pressure.