Secondary active transport occurs in the small intestine, where the uptake of glucose is coupled to the transport of sodium ions into the cells lining this organ.This type of transport system is called
A) a uniporter.
B) a symporter.
C) an exchange channel.
D) diffusion.
E) an antiporter.

Question

Quizplus · Accepted Answer

In secondary active transport, the movement of one molecule against its concentration gradient is coupled to the movement of another molecule down its concentration gradient. In the small intestine, glucose is co-transported with sodium ions into the cells lining the organ in a symporter mechanism. This means that both molecules move in the same direction, from outside to inside the cell. Therefore, the correct answer is B) a symporter.

Secondary Active Transport Occurs in the Small Intestine, Where the Uptake