Choose the correct answer: Water reabsorption by the renal tubules uses

Choose the correct answer:

Water reabsorption by the renal tubules uses

A. active transport.

B. cotrsnsport.

C. solvent drag.

D. osmosis.

Answer: A. active transport.

In the case of Water reabsorption, renal tubules in the kidneys use active transport mostly. Transport is a process that requires the utilization of energy for substances to be transported across the various layers of the cell; water molecules included are transported from a region of low concentration to a region of high concentration contrary to the concentration gradient. Unlike other fluids, the movement of water in the renal tubules is an organised function carried out by a set of specialised proteins called aquaporin that helps in the active transport of water from the tubular filtrate to the bloodstream. This process is useful to make sure that the body has the appropriate levels of fluid in it and to regulate the concentration levels of fluids. Other processes including cotransport, solvent drag, and osmosis might exist and may also be responsible for the reabsorption of water in the renal tubule but the main drive is active transport.