Question

If the glucose has been actively transported by the intestine from mucosal to serosal side then

A) Yes, via facilitated diffusion
B) No, it is a passive process
C) Maybe, depending on the concentration gradient
D) Only during periods of stress

Answer 1

Glucose absorption in the intestine involves active transport, requiring energy and occurring against the concentration gradient.

Step-by-step explanation:

Glucose absorption in the intestine involves active transport. Glucose binds to a carrier protein in the outer membrane of the intestinal wall, along with two Na+ ions. The carrier protein moves glucose and Na+ into the cell, where glucose diffuses into the blood. To continue the active transport process, Na+ ions are expelled from the cell through a Na+/K+ ATPase pump, while K+ is exchanged. This process requires energy and occurs against the concentration gradient, making option C) Maybe, depending on the concentration gradient, the correct answer.