Collecting duct

Collecting duct

The collecting duct is the last part where water and solutes can be resorbed and the final composition of urine is determined. The hormone aldosterone regulates the salt resorption; anti-diuretic hormone (ADH) controls the permeability for water. Na+ ions are exchanged for other positive ions. Bicarbonate ions are exchanged for Cl- ions or H+ ions. The latter is important in balancing acid-base levels. The process of deamination reveals HCO3-and NH4+ions. Both ions serve in countertransports with other ions.

1

What is NOT true about regulation of water excretion?

2

The collecting duct is the site where the physiology is disrupted in a certain type of diabetes. Which one?