Question

what kind of inhibitor is cimetidine?
a) combined
b) competitive
c) uncompetitived) noncompetitive

Explanation:

Cimetidine acts by competing with histamine for the active site of the H₂ receptor (a type of enzyme-like target in gastric parietal cells), blocking histamine's action to reduce stomach acid. This mechanism matches competitive inhibition, where an inhibitor binds to the active site of a target, competing with the natural substrate/ligand.

Answer:

b) Competitive