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The pathophysiology of anxiety disorders is thought to result from which area of the brain?

A.

Raphe nucleus

B.

Ventral tegmental area

C.

Hypothalamic pituitary adrenal (HPA) axis

D.

Locus coeruleus

Answer and Explanation

The Correct Answer is C

Choice A reason: The raphe nucleus primarily regulates serotonin production and mood but is not the central mechanism in anxiety pathophysiology.

Choice B reason: The ventral tegmental area is part of the reward pathway and is associated with dopamine, relevant to motivation and addiction, not primary anxiety mechanisms.

Choice C reason: This is correct. Dysregulation of the HPA axis is central to anxiety disorders. Activation of the amygdala triggers the hypothalamus to release CRH, stimulating ACTH from the pituitary, which then triggers cortisol release from the adrenal glands. Chronic activation can lead to persistent anxiety symptoms.

Choice D reason: The locus coeruleus regulates norepinephrine and arousal; while it contributes to anxiety responses, the HPA axis is the primary system implicated in sustained anxiety disorders.


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Related Questions

Correct Answer is D

Explanation

Choice A reason: This is incorrect because cyclopentolate is a mydriatic and cycloplegic agent; it does the opposite of constriction. Constricting the pupils and contracting the ciliary muscles is the effect of a miotic, not cyclopentolate.

Choice B reason: Cyclopentolate is not a topical anesthetic; corneal anesthesia is typically achieved with proparacaine or tetracaine.

Choice C reason: Cyclopentolate does not add moisture to the eyes; artificial tears are used for lubrication.

Choice D reason: This is correct. Cyclopentolate is a parasympatholytic agent that dilates the pupil (mydriasis) and paralyzes the ciliary muscle (cycloplegia), which is necessary for ophthalmologic examination and cataract surgery preparation.

Correct Answer is D

Explanation

Choice A reason: EMDR is effective for PTSD broadly but is not the first-line treatment specifically for nightmares.

Choice B reason: Hypnosis has limited evidence and is not considered a first-line treatment for PTSD-related nightmares.

Choice C reason: Progressive muscle relaxation may reduce general anxiety but has limited efficacy for nightmare-specific symptoms.

Choice D reason: This is correct. Image rehearsal therapy has the highest level of evidence for reducing the frequency and intensity of PTSD-related nightmares. It involves rescripting the nightmare during wakefulness to alter its content and emotional impact.

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