An agonist is a substance that:
a) Interacts with the receptor without producing any effect
b) Interacts with the receptor and initiates changes in cell function, producing various effects
c) Increases concentration of another substance to produce effect
d) Interacts with plasma proteins and doesn’t produce any effect
The correct answer is (b) Interacts with the receptor and initiates changes in cell function, producing various effects.
An agonist is a substance that binds to a receptor and triggers a response, producing a physiological or pharmacological effect. Agonists can be endogenous (produced by the body) or exogenous (administered as a drug).