Q: Which of the following equations correctly represents the relationship between sodium retention and potassium excretion in the nephron under the influence of aldosterone?

$$\text{Na}^+_{reabsorbed} \uparrow \implies \text{K}^+_{excreted} \uparrow$$

Question 1

Which layer of the adrenal cortex is primarily responsible for the synthesis of aldosterone, and what is the main function of this hormone?

Accepted Answer

Zona glomerulosa; conserves sodium and water by acting on the distal nephron

Question 2

A patient presents with hyperpigmentation of the skin, hyponatremia, and hypotension. Laboratory tests reveal elevated ACTH levels. Which disorder is most consistent with these findings?

Accepted Answer

Primary adrenal cortex insufficiency (Addison's disease)

Question 3

Which hormone stimulates the adrenal cortex to produce cortisol, and from which gland is it released?

Accepted Answer

Adrenocorticotropic hormone (ACTH); anterior pituitary

Question 4

Cortisol has multiple effects on metabolism. Which of the following best describes its action?

Accepted Answer

Increases blood glucose by stimulating gluconeogenesis and antagonizing insulin

Question 5

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

Accepted Answer

Moon face, buffalo hump, muscle wasting, and hypertension

Question 6

Which of the following equations correctly represents the relationship between sodium retention and potassium excretion in the nephron under the influence of aldosterone?

Accepted Answer

$$	ext{Na}^+_{reabsorbed} \uparrow \implies 	ext{K}^+_{excreted} \uparrow$$

Question 7

A patient with primary hyperaldosteronism (Conn's syndrome) is most likely to exhibit which laboratory findings?

Accepted Answer

High sodium, low potassium, and hypertension

Question 8

Which of the following best explains why patients with Addison's disease may develop hyperpigmentation?

Accepted Answer

Elevated ACTH stimulates melanocytes due to shared precursor with MSH

Question 9

Which hormone is synthesized from cholesterol in the adrenal cortex and is essential for the body's response to stress?

Accepted Answer

Cortisol

Question 10

A patient abruptly stops taking synthetic corticosteroids after long-term use. Which adrenal disorder is most likely to develop, and why?

Accepted Answer

Secondary adrenal insufficiency; suppression of ACTH production by the pituitary

Question 11

Which of the following is a direct effect of glucocorticoids on the immune system?

Accepted Answer

Decrease cell immunity by suppressing T cells and macrophages

Question 12

Which of the following best describes the regulation of aldosterone secretion?

Accepted Answer

Regulated mainly by the renin-angiotensin pathway; angiotensin II is the primary stimulant

Question 13

A patient with secondary adrenal insufficiency will NOT exhibit which of the following symptoms?

Accepted Answer

Hyponatremia due to decreased aldosterone

Question 14

Which of the following is a consequence of excess aldosterone secretion?

Accepted Answer

Hypokalemia and metabolic alkalosis

Question 15

Which equation best represents the negative feedback regulation of cortisol secretion?

Accepted Answer

$$	ext{High cortisol} ightarrow 	ext{decreased ACTH and CRH}$$

Question 16

Which of the following scenarios would most likely lead to secondary hyperaldosteronism?

Accepted Answer

Bilateral renal artery stenosis causing increased renin release

Question 17

Which hormone is produced in the zona reticularis of the adrenal cortex and can be converted into estrogen in peripheral tissues, especially in obese individuals?

Accepted Answer

Androgens

Question 18

A patient with adrenal crisis presents with vascular collapse, hypoglycemia, and low blood pressure. What is the most immediate treatment priority?

Accepted Answer

Provide corticosteroid replacement and intravenous fluids

Question 19

Which of the following best describes the effect of cortisol on bone formation?

Accepted Answer

Inhibits bone formation and may lead to osteoporosis

Question 20

Which of the following is a common cause of primary adrenal cortex insufficiency (Addison's disease) in developed countries?

Accepted Answer

Autoimmune destruction of the adrenal cortex

Adrenal Glands: Structure, Hormones, and Disorders

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