Question 1

Which of the following best describes the relationship between Process-S and Process-C in the regulation of sleep, as depicted in the first image?

Accepted Answer

The greatest urge to sleep occurs when the distance between Process-S and Process-C is at its maximum, with Process-S high and Process-C low.

Question 2

A patient presents with frequent awakenings and reports vivid, often disturbing dreams. Polysomnography reveals low EEG amplitude, mixed frequency, and rapid eye movements during these episodes. Which sleep stage is most likely affected?

Accepted Answer

REM

Question 3

Which hypothalamic nucleus is primarily responsible for the regulation of circadian rhythms and receives direct input from the retina?

Accepted Answer

Suprachiasmatic nucleus

Question 4

Which of the following best explains why a high-fat, low-fiber diet can increase neuroinflammation and risk for neurodegenerative diseases?

Accepted Answer

It disrupts the gut microbiome, reduces SCFA production, and weakens the intestinal and blood-brain barriers, promoting inflammation.

Question 5

Which hormone is released by the posterior pituitary gland and is essential for water reabsorption in the kidneys and regulation of blood pressure?

Accepted Answer

Vasopressin (ADH)

Question 6

A lesion in which hypothalamic region would most likely result in hyperphagia (excessive eating)?

Accepted Answer

Destruction of the ventromedial hypothalamus

Question 7

Which EEG characteristics are most associated with N3 (deep NREM) sleep?

Accepted Answer

High amplitude, low frequency, delta waves

Question 8

Which of the following is a key function of the Papez circuit as shown in the diagram?

Accepted Answer

Integration of emotional processing and memory consolidation

Question 9

Which hormone is secreted by adipose tissue and acts on the hypothalamus to inhibit hunger?

Accepted Answer

Leptin

Question 10

A patient with damage to the suprachiasmatic nucleus (SCN) would most likely experience which of the following symptoms?

Accepted Answer

Disrupted sleep-wake cycles and impaired circadian rhythms

Question 11

Which of the following best describes the feedback loop involved in the hypothalamic-pituitary-adrenal (HPA) axis during stress?

Accepted Answer

Hypothalamus releases CRH → Pituitary releases ACTH → Adrenal cortex releases cortisol → Hippocampus detects cortisol and inhibits hypothalamus

Question 12

Which of the following is a hallmark of neurodegenerative diseases?

Accepted Answer

Formation of misfolded protein aggregates and neuroinflammation

Question 13

Which sleep stage is most associated with muscle atonia and vivid dreaming?

Accepted Answer

REM

Question 14

Which of the following best explains why memory of a near-death experience (NDE) cannot be formed if the brain is truly dead?

Accepted Answer

The hippocampus must be active to encode memory, so no memory can be formed without brain activity.

Question 15

Which of the following is a function of melatonin beyond promoting sleep?

Accepted Answer

Regulating seasonal reproduction and acting as an antioxidant

Question 16

Which brain region is the primary site for integrating signals related to hunger and satiety, and is influenced by hormones such as leptin and ghrelin?

Accepted Answer

Arcuate nucleus of the hypothalamus

Question 17

Which of the following best describes the effect of chronic stress on the hippocampus?

Accepted Answer

It reduces hippocampal size, impairing its ability to regulate cortisol levels.

Question 18

Which of the following is a distinguishing feature of the lateral hypothalamus?

Accepted Answer

It is the feeding center and stimulates eating and arousal when activated.

Question 19

Which of the following best describes the EEG pattern during REM sleep?

Accepted Answer

Low amplitude, mixed frequency, alpha/beta waves

Question 20

Which of the following is a primary function of the suprachiasmatic nucleus (SCN)?

Accepted Answer

Master control of circadian rhythms

Hormones, Hypothalamus, Sleep, and Biological Rhythms: ANP Study Guide

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