Which of the following signs and symptoms did the girl most likely experience just after smoking?

Correct Answer: B

Rationale: The correct answer is B: Increased heart rate. When smoking, nicotine enters the bloodstream and stimulates the release of adrenaline, leading to increased heart rate. Hypertension (choice A) may occur over time with consistent smoking. Depressive mood (choice C) is more commonly associated with withdrawal symptoms rather than immediate effects. Hyperalgesia (choice D), increased sensitivity to pain, is not a typical immediate effect of smoking.

Correct Answer: C

Rationale: The correct answer is C: Phencyclidine. PCP is a dissociative anesthetic that can cause hallucinations, agitation, and violent behavior. The patient's signs and symptoms align with the effects of PCP use. Cocaine (A) typically causes increased energy and alertness, heroin (B) causes sedation and respiratory depression, and LSD (D) causes hallucinations and altered perceptions, but these do not match the patient's presentation.

Correct Answer: B

Rationale: The correct answer is B: Serotonin. Given the drug's effects, which are likely related to mood regulation and emotional stability, serotonin is the most likely neurotransmitter involved. Serotonin plays a key role in mood, anxiety, and depression. Acetylcholine (A) is more related to muscle movement and memory. Norepinephrine (C) is associated with the fight-or-flight response. GABA (D) is an inhibitory neurotransmitter, primarily involved in reducing neuronal excitability and promoting relaxation, not mood regulation.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.