During digestion,the concentration of hydrogen ions (H+)in the stomach contents increases to many times that in cells lining the stomach.Which transport process could be responsible?
A)osmosis
B)simple diffusion
C)facilitated diffusion
D)active transport
E)exocytosis

Question

Quizplus · Accepted Answer

The concentration of hydrogen ions (H+) in the stomach contents is much higher than that in the cells lining the stomach. This suggests that active transport is responsible for transporting H+ ions from the cells lining the stomach into the stomach contents. Active transport is necessary to move ions against their concentration gradient, from an area of low concentration to an area of high concentration. This process requires the input of energy (in the form of ATP) by the cells lining the stomach. Therefore, choice D, active transport, is the best answer.

During Digestion,the Concentration of Hydrogen Ions (H+)in the Stomach Contents