Which of the following opiate receptors is paired correctly with a physiological or psychological action?

Correct Answer: C

Rationale: Mu receptors (choice C) mediate respiratory depression, a key morphine effect. Mu doesn't cause dysphoria (choice A), kappa causes dysphoria, not euphoria (choice B), and delta (choice D) isn't primarily dysphoric. This correct pairing reflects opioid pharmacology.

Correct Answer: B

Rationale: Diazepam, a benzodiazepine, can cause anterograde amnesia, impairing the ability to form new memories while on the medication.

Correct Answer: D

Rationale: The signs and symptoms described in the text, such as talkativeness, mydriasis, muscle twitching, hand tremor, elevated blood pressure, and increased heart rate, are consistent with the effects of amphetamine use. Amphetamine is a stimulant drug that can cause these symptoms by increasing the release of neurotransmitters like dopamine and norepinephrine in the brain. Additionally, the patient being a drug user who tried different drugs supports the likelihood of amphetamine use, as it is commonly abused for its stimulant effects.

Correct Answer: D

Rationale: Colchicine toxicity can lead to alopecia, bone marrow suppression (blood dyscrasias), and severe gastrointestinal effects such as diarrhea and vomiting.

Correct Answer: D

Rationale: Alzheimer's disease is associated with cholinergic neuron degeneration.