ADM Anatomy & Physiology Fundamentals 2

Question 1

Which neurotransmitter system is most directly responsible for the euphoric effects of opioids in the ventral tegmental area (VTA)?

Accepted Answer

Dopaminergic system

Answer

Opioids disinhibit dopamine neurons in the VTA by suppressing GABAergic interneurons, leading to increased dopamine release in the nucleus accumbens and producing euphoria.

Question 2

The blood-brain barrier (BBB) is primarily formed by which cell type?

Accepted Answer

Brain capillary endothelial cells with tight junctions

Answer

Brain capillary endothelial cells connected by tight junctions form the primary structural basis of the BBB, which regulates substance entry into the CNS.

Question 3

Which hepatic enzyme system is primarily responsible for first-pass metabolism of most drugs of abuse?

Accepted Answer

Cytochrome P450 (CYP) enzymes

Answer

The cytochrome P450 enzyme system, particularly CYP3A4, CYP2D6, and CYP2C19, handles first-pass metabolism of the majority of drugs including most substances of abuse.

Question 4

The nucleus accumbens, a key structure in addiction, is located within which brain region?

Accepted Answer

Ventral striatum

Answer

The nucleus accumbens is part of the ventral striatum and serves as a critical node in the mesolimbic reward circuit.

Question 5

Which receptor subtype mediates the analgesic and euphoric effects of heroin?

Accepted Answer

Mu (μ) opioid receptor

Answer

The mu (μ) opioid receptor is the primary mediator of opioid analgesia, euphoria, and respiratory depression, making it central to opioid addiction.

(ADM) Board Certified Addiction Medicine Specialist Practice Test

(ADM) Board Certified Addiction Medicine Specialist Practice Test

ADM Anatomy & Physiology Fundamentals 2