Question 1

Which layer of the adrenal cortex is primarily responsible for producing mineralocorticoids, and what is the main function of these hormones?

Accepted Answer

Zona glomerulosa; regulate blood electrolyte concentrations

Question 2

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

Accepted Answer

Aldosteronism

Question 3

Which hormone is secreted by the adrenal medulla and is primarily responsible for increasing heart rate and blood pressure during the fight-or-flight response?

Accepted Answer

Epinephrine

Question 4

The renin-angiotensin-aldosterone system is activated in response to a drop in blood pressure. Which sequence correctly describes the pathway leading to aldosterone release?

Accepted Answer

Renin converts angiotensinogen to angiotensin I, which is converted to angiotensin II, stimulating aldosterone release

Question 5

Which of the following is a direct effect of increased plasma potassium ($$K^+) $$concentration on the adrenal cortex?

Accepted Answer

Stimulation of aldosterone release from the zona glomerulosa

Question 6

Atrial natriuretic peptide (ANP) is secreted by the heart in response to high blood pressure. What is its effect on adrenal hormone secretion?

Accepted Answer

It blocks renin and aldosterone secretion to decrease blood pressure

Question 7

Which hormone is most potent in regulating sodium ($$Na^+) $$reabsorption and potassium ($$K^+) $$excretion in the kidneys?

Accepted Answer

Aldosterone

Question 8

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

Accepted Answer

High blood glucose, muscle and bone protein loss, and hypertension

Question 9

Which feedback mechanism regulates cortisol secretion from the adrenal cortex?

Accepted Answer

Negative feedback from rising cortisol levels on CRH and ACTH

Question 10

During periods of long-term stress, which hormone is primarily responsible for maintaining blood glucose levels through gluconeogenesis?

Accepted Answer

Cortisol

Question 11

Which of the following best describes the metabolic effects of cortisol during stress?

Accepted Answer

Promotes protein breakdown and signals adipose tissue to release fatty acids

Question 12

A patient with Addison's disease is likely to present with which combination of symptoms?

Accepted Answer

Weight loss, low blood glucose and sodium, high potassium, and dehydration

Question 13

Which hormone is the main source of estrogens in postmenopausal women?

Accepted Answer

Gonadocorticoids from the adrenal cortex

Question 14

Which of the following is a likely effect of hypersecretion of gonadocorticoids in prepubertal males?

Accepted Answer

Early maturation of reproductive organs and increased sex drive

Question 15

Which of the following equations best represents the relationship between sodium reabsorption and water retention in the kidneys?

Accepted Answer

$$\Delta V_{water} \propto \Delta [Na^+]_{reabsorbed}$$

Question 16

Which hormone is released in response to stress and can override its own negative feedback inhibition, leading to increased secretion?

Accepted Answer

Cortisol

Question 17

A tumor of the medullary chromaffin cells (pheochromocytoma) would most likely result in which of the following symptoms?

Accepted Answer

Uncontrolled sympathetic activity: rapid heartbeat, hypertension, and intense nervousness

Question 18

Which of the following best explains why water follows sodium ($$Na^+) $$during reabsorption in the kidneys?

Accepted Answer

Water moves by osmosis toward higher sodium concentration

Question 19

Which hormone is responsible for stimulating the release of cortisol from the adrenal cortex?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 20

Which of the following is a direct effect of excessive glucocorticoid levels on the immune system?

Accepted Answer

Suppression of immune response and increased risk of infection

Adrenal Glands: Hormones, Electrolyte Balance, and Stress Response

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