A dose–response curve shows that noncompetitive antagonists alter both the and the of the agonist, while competitive antagonists alter only the .

1.  potency,

2. efficacy,

3. potency

Explanation:

The dose-response curve is a graphical representation, which describes the level of the reaction of individuals or subjects to certain inducement after a given period of time.

Hence, in this situation, a dose-response curve shows that noncompetitive antagonists alter both the POTENCY and the EFFICACY of the agonist, while competitive antagonists alter only the POTENT.