How does an inhibitor slow down a reaction and a catalyst speed up a reaction?

How does an inhibitor slow down a reaction and a catalyst speed up a reaction?
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A catalyst works by providing a reaction route with a loweractivation energy. An inhibitor slows a reaction and can work inseveral ways, for instance by tying up one of the reactants. Wealso use the term when we say catalyst inhibitor, which issomething which binds to the active sites on a heterogeneouscatalyst.
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