Marjorie takes an anti-anxiety drug so that she can sleep better and remain calm enough to study effectively. She begins by taking 25 milligrams every evening, but within a month this dose is no longer helping, so she takes two pills. After another month this dosage is no longer effective. This is happening because
A)her immune system is rejecting the drug.
B)she has developed tolerance, which means that her liver can no longer metabolize the drug, so it remains active for too long.
C)the number of receptors to which the drug binds on neurons has declined.
D)the number of receptors to which the drug binds on neurons has increased.

Question

Quizplus · Accepted Answer

Marjorie is experiencing tolerance to the anti-anxiety drug, which often involves the body's adaptive response to the presence of the drug, such as reducing the number of receptors available for the drug to bind to, thereby diminishing its effectiveness.

Marjorie Takes an Anti-Anxiety Drug So That She Can Sleep