Methadone is a drug given to treat heroin addicts. It works by binding to the same receptors as heroin but with greater affinity, thereby preventing heroin from binding. This is an example of
A) competition.
B) down-regulation.
C) signal transduction.
D) agonistic behavior.
E) up-regulation.

Question

Quizplus · Accepted Answer

Methadone and heroin both bind to the same receptors, but methadone has a greater affinity for these receptors, meaning that it will outcompete heroin for binding sites. This is an example of competition between the two drugs.

Methadone Is a Drug Given to Treat Heroin Addicts