Put the following steps of stomach acid production in the correct order starting with the reaction that requires an enzyme.
1) Carbonic acid dissociates.
2) Chloride ion combines with H+ in the gastric lumen.
3) Water and CO2 combine to form carbonic acid.
4) H+ and bicarbonate ion are transported into the gastric lumen.
5) Cl- diffuses into the gastric lumen.
A) 3, 1, 2, 5, 4
B) 1, 3, 5, 2, 4
C) 4, 5, 3, 1, 2
D) 4, 5, 1, 2, 3
E) 3, 1, 4, 5, 2

Question

Quizplus · Accepted Answer

The correct sequence starts with the combination of water and CO2 to form carbonic acid (3), which requires the enzyme carbonic anhydrase. Then, carbonic acid dissociates into H+ and bicarbonate ion (1). Next, H+ and bicarbonate ion are transported into the gastric lumen (4), followed by the diffusion of Cl- into the gastric lumen (5). Finally, the chloride ion combines with H+ in the gastric lumen to form hydrochloric acid (2).

Put the Following Steps of Stomach Acid Production in the Correct