What Two Effects Does PTH Exert on the Kidneys

Question

What two effects does PTH exert on the kidneys? A) Blocks sodium reabsorption and increases the excretion of water B) Increases calcium reabsorption and increases the excretion of phosphate in the urine C) Decreases the reabsorption of both calcium and phosphate D) Increases the excretion of H⁺ and the excretion of bicarbonate

Accepted Answer

PTH increases calcium reabsorption in the kidneys, which helps to maintain normal calcium levels in the blood. At the same time, it increases the excretion of phosphate in the urine, which helps to lower blood phosphate levels. This is an important balance, as high levels of both calcium and phosphate can lead to the formation of kidney stones and other complications.