This graph shows the dose-response curves for two different chemicals. For
the chemical represented by Line A, the response begins at a very low dose
and increases sharply. The maximum response is reached at a low concentration.
For the chemical represented by Line B, the response increases only gradually
as the dose of chemical is increased. Scientists would say that the chemical
graphed as Line B has a lower potency than the chemical in Line A because
it takes a greater dose of chemical to cause a similar response.
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