Exploring Drug Effects

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Questions and Answers

Which of the following is a characteristic of tolerance?

Tolerance is an increase in the effectiveness of a drug that is administered repeatedly.
Tolerance is the brain's way of increasing dopamine sensitivity.
Tolerance is a decrease in the effectiveness of a drug that is administered repeatedly. (correct)
Tolerance is the brain's way of protecting itself from excitotoxicity.

What happens to dopamine receptors in the brain as heroin addiction develops?

Dopamine receptors are resorbed, leading to decreased dopamine sensitivity. (correct)
Dopamine receptors are produced in larger quantities, leading to decreased dopamine sensitivity.
Dopamine receptors are resorbed, leading to increased dopamine sensitivity.
Dopamine receptors are produced in larger quantities, leading to increased dopamine sensitivity.

What is the effect of a depleted reward system on a drug addict?

A depleted reward system has no effect on a drug addict's sensitivity to the rewarding neurotransmitter.
A depleted reward system makes a drug addict more sensitive to the rewarding neurotransmitter.
A depleted reward system causes excitotoxicity in a drug addict.
A depleted reward system makes a drug addict less sensitive to the rewarding neurotransmitter. (correct)

Which of the following best describes negative reinforcement?

A concept of Operant conditioning that presents certain reinforcers, which increases the behavior of the subject in order to avoid those reinforcers. (D) Signup and view all the answers