He movement of water out of the proximal convoluted tubule follows Na+ by osmosis and is referred to as obligatory water reabsorption.
Regardless of the body's level of hydration, the term "obligatory water reabsorption" refers to the reabsorption of water in the early parts of the nephron that occurs independently of the antidiuretic hormone (ADH), also known as vasopressin.
Osmosis is the naturally occurring net movement or diffusion of solvent molecules over a selectively permeable membrane from a location of high water potential to a region of low water potential, in a manner that tends to balance the solute concentrations on the two sides.
To know more about osmosis visit:
https://brainly.com/question/1799974
#SPJ4
