When the ECF contains high levels of potassium (K+), which of the following helps to decrease K+ concentration in the ECF?
a. The PTH-controlled secretion of K+ into the nephron tubules
b. The aldosterone-controlled secretion of K+ into the nephron tubules
c. The secretion of K+ into the hepatic portal vein
d. The increased formation of bicarbonate in the filtrate
e. The reabsorption of K+ from the nephron tubules.
