Difficulty: Medium
Average Score: 89%
Simulated
What mechanism explains Omeprazole├óÔé¼Ôäós effect on gastric acidity?
Correct answer
A
Rationale
Omeprazole, a proton pump inhibitor (PPI), acts by irreversibly blocking the H├ó┬ü┬║/K├ó┬ü┬║-ATPase enzyme system located in the gastric parietal cell membrane, the final pathway for acid secretion. This results in profound and long-lasting suppression of gastric acid production. The measured rise in gastric pH from acidic to near-neutral (pH 6.5) reflects this inhibition. Unlike H├óÔÇÜÔÇÜ blockers such as ranitidine, PPIs provide prolonged acid control and promote ulcer healing, making them the first-line treatment for GERD and peptic ulcer disease.