Tubular reabsorption involves
A) active transport
B) cotransport
C) facilitated diffusion
D) countertransport
E) all of these

Question

Quizplus · Accepted Answer

Tubular reabsorption can involve all of these processes. Active transport is the movement of molecules from an area of lower concentration to an area of higher concentration, which requires energy. Cotransport involves the movement of two or more molecules across a membrane at the same time in the same direction. Facilitated diffusion involves the movement of molecules from an area of higher concentration to an area of lower concentration with the help of a transport protein. Countertransport involves the movement of two or more molecules across a membrane in opposite directions. The reabsorption process in the kidney tubules can involve any of these processes, depending on the specific solutes being reabsorbed.

Tubular Reabsorption Involves