Nephron Reabsorption: Loop of Henle, DCT, and Collecting Duct

What is reabsorbed in the descending limb of the loop of Henle?

Water.

What is reabsorbed in the thick ascending limb of the loop of Henle?

Na+, K+, and Cl− via Na+-K+-2Cl− symporters.

Is the thick ascending limb permeable to water?

No, it is impermeable to water.

What is reabsorbed in the early distal convoluted tubule (DCT)?

Water and Na+, Cl− via symporters.

How does PTH affect the early DCT?

Increases calcium reabsorption and inhibits phosphate reabsorption in the PCT.

What do principal cells in the late DCT and CD do?

Reabsorb Na+ and water (under ADH control) and secrete K+.

What do intercalated cells in the late DCT and CD do?

Reabsorb K+ and HCO3−, secrete H+; play a key role in acid-base balance.