The Dopamine D₂ Hypothesis Suggests This Receptor Subtype

question 12

Multiple Choice

The dopamine D₂ hypothesis suggests this receptor subtype

• A)is involved in the termination of drug-induced euphoria.
• B)is found mainly in regions of the brain involved in planning and risk assessment, but not in the reward cascade.
• C)is found mainly in regions of the brain involved in the reward cascade.
• D)was once considered a possible contributor to the development of SUDs, but this theory has since been proven false.

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Definitions:

Depolarizes

The process by which the electrical charge of a neuron's membrane decreases, moving towards zero or becoming less negative.

Hyperpolarizes

Refers to an increase in the membrane potential of a cell, making the interior more negatively charged relative to the outside and reducing the likelihood of generating an action potential.

Absolute Refractory Period

A period immediately following the transmission of an impulse in nerve or muscle in which it cannot respond to another stimulus, ensuring the unidirectional flow of impulses.

Cardiac Muscle Cells

Specialized muscle cells found in the heart that have the ability to contract automatically and rhythmically, contributing to heart contraction.