What occurs when a drug binds to a receptor in the body?
a. It alters the receptor to become nonres-ponsive to its usual endogenous molecules.
b. It increases or decreases the activity of that receptor.
c. It gives the receptor a new function.
d. It prevents the action of the receptor by altering its response to chemical mediators.
B
When a drug binds to a receptor, it mimics or blocks the actions of the usual endogenous regula-tory molecules, either increasing or decreasing the rate of the physiologic activity normally con-trolled by that receptor. It does not alter the activity of the receptor and does not give the receptor a new function.
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