Q: Which equation best represents the relationship between sodium concentration and extracellular fluid volume?

$$\text{ECF Volume} \propto [\text{Na}^+]$$

Q: Which equation represents the effect of aldosterone on sodium and potassium transport in kidney tubules?

$$\text{Na}^+ \text{ reabsorption} \uparrow$$, $$\text{K}^+ \text{ secretion} \uparrow$$

Question 1

Which layer of the adrenal cortex is primarily responsible for the secretion of mineralocorticoids, and what is the main mineralocorticoid produced?

Accepted Answer

Zona glomerulosa; aldosterone

Question 2

A patient presents with hypertension, edema, and muscle weakness. Laboratory tests reveal excessive loss of potassium ions. Which adrenal disorder is most likely responsible for these symptoms?

Accepted Answer

Aldosteronism

Question 3

Which hormone is released in response to decreased blood volume and blood pressure, and what is its primary effect on the kidneys?

Accepted Answer

Aldosterone; increases sodium reabsorption

Question 4

What is the primary metabolic effect of cortisol during stress?

Accepted Answer

Promotes gluconeogenesis from fats and proteins

Question 5

Which equation best represents the relationship between sodium concentration and extracellular fluid volume?

Accepted Answer

$$	ext{ECF Volume} \propto [	ext{Na}^+]$$

Question 6

A patient with Cushing's syndrome is likely to exhibit which of the following symptoms?

Accepted Answer

Swollen 'moon' face and 'buffalo hump' on the upper back

Question 7

Which hormone inhibits the renin-angiotensin-aldosterone system and decreases blood pressure by promoting sodium and water excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 8

During a stressful event, which sequence correctly describes the hormonal pathway leading to increased cortisol secretion?

Accepted Answer

Hypothalamus releases CRH → Anterior pituitary releases ACTH → Adrenal cortex releases cortisol

Question 9

Which of the following is NOT a direct effect of excessive glucocorticoid levels?

Accepted Answer

Enhanced melanin production

Question 10

A female patient develops a beard, masculine body hair distribution, and an enlarged clitoris. Which adrenal disorder is most likely responsible?

Accepted Answer

Adrenogenital syndrome

Question 11

Which hormone is secreted by the adrenal medulla and is responsible for the fight-or-flight response?

Accepted Answer

Epinephrine

Question 12

What is the effect of increased plasma potassium concentration on aldosterone secretion?

Accepted Answer

Stimulates aldosterone release

Question 13

Which of the following best describes the negative feedback regulation of cortisol?

Accepted Answer

High cortisol inhibits CRH and ACTH release

Question 14

Which equation represents the effect of aldosterone on sodium and potassium transport in kidney tubules?

Accepted Answer

$$	ext{Na}^+ 	ext{ reabsorption} \uparrow$$, $$	ext{K}^+ 	ext{ secretion} \uparrow$$

Question 15

Which hormone is essential for life and accounts for more than 95% of mineralocorticoids produced by the adrenal cortex?

Accepted Answer

Aldosterone

Question 16

Which clinical sign is most likely to be observed in a patient with Addison's disease?

Accepted Answer

Bronzing of the skin

Question 17

Which hormone is released by the heart in response to increased blood pressure and acts to decrease blood volume?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 18

Which of the following is a direct effect of ACTH on the adrenal cortex?

Accepted Answer

Stimulates aldosterone release under severe stress

Question 19

Which hormone is primarily responsible for maintaining blood glucose levels during periods of fasting?

Accepted Answer

Cortisol

Question 20

Which equation best represents the effect of the renin-angiotensin-aldosterone system on blood pressure?

Accepted Answer

$$	ext{BP} \uparrow 	ext{ as } 	ext{Renin} ightarrow 	ext{Angiotensin II} ightarrow 	ext{Aldosterone} ightarrow 	ext{Na}^+ 	ext{ reabsorption}$$

Adrenal Glands: Structure, Hormones, and Stress Response

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