Addiction Medicine Certification Neurobiology of Addiction 2

Question 1

How do opioids primarily produce their analgesic and euphoric effects?

Accepted Answer

By activating mu-opioid receptors coupled to inhibitory G proteins

Answer

By blocking dopamine reuptake transporters

Answer

By inhibiting serotonin reuptake

Answer

By potentiating GABA-A receptor activity

Question 2

Alcohol's sedative effects are primarily mediated through which mechanism?

Accepted Answer

Potentiation of GABA-A receptors and inhibition of NMDA glutamate receptors

Answer

Increased dopamine release in the striatum

Answer

Blockade of serotonin 5-HT3 receptors

Answer

Direct activation of mu-opioid receptors

Question 3

Why does abrupt alcohol withdrawal cause seizures?

Accepted Answer

Rebound NMDA receptor hyperactivity and reduced GABA function due to neuroadaptation

Answer

Excessive dopamine surge in the striatum

Answer

Rapid opioid receptor downregulation

Answer

Hypoglycemia from impaired hepatic gluconeogenesis

Question 4

What is the primary mechanism by which cocaine produces its euphoric effects?

Accepted Answer

Blocking reuptake transporters for dopamine, norepinephrine, and serotonin

Answer

Activating opioid receptors in the VTA

Answer

Potentiating GABA activity in the nucleus accumbens

Answer

Blocking NMDA glutamate receptors

Question 5

What role does the prefrontal cortex play in addiction?

Accepted Answer

It mediates impulse control and decision-making, both of which are impaired in addiction

Answer

It generates the subjective craving sensation for all substances

Answer

It produces endogenous opioids that modulate reward

Answer

It controls the autonomic symptoms of withdrawal

Question 6

The endocannabinoid system's primary role in addiction neurobiology involves:

Accepted Answer

Modulating synaptic plasticity and reward processing via CB1 and CB2 receptors

Answer

Producing withdrawal symptoms common to all substance use disorders

Answer

Controlling respiratory depression during opioid overdose

Answer

Regulating blood pressure changes during stimulant intoxication

Question 7

Which neurobiological change is particularly severe and long-lasting in methamphetamine addiction?

Accepted Answer

Dopaminergic neurotoxicity with loss of striatal dopamine terminals

Answer

Decreased GABA receptor density in the cortex

Answer

Permanent mu-opioid receptor upregulation

Answer

Irreversible loss of serotonin synthesis capacity