In kidney cells, charged ions like sodium and chloride are reabsorbed from the urine against a concentration gradient. Which mode of cellular transport is employed here?
Select one of the options below as your answer:

*
A.
Facilitated diffusion
*
B.
Simple diffusion
*
C.
Osmosis
*
D.
Active transport

Question

In kidney cells, charged ions like sodium and chloride are reabsorbed from the urine against a concentration gradient. Which mode of cellular transport is employed here?
Select one of the options below as your answer:

*
      A.
      Facilitated diffusion
    *
      B.
      Simple diffusion
    *
      C.
      Osmosis
    *
      D.
      Active transport

aaronq · Answer

Keywords: "against a concentration gradient"