Steroid Hormones

Which layer of the adrenal cortex predominantly secretes mineralocorticoids?
Zona glomerulosa
Zona fasciculata
Zona reticularis
Adrenal medulla

Which layer of the adrenal cortex is responsible for producing glucocorticoids like cortisol?
Zona fasciculata
Zona glomerulosa
Zona reticularis
Adrenal medulla

Which layer of the adrenal cortex handles the production of androgens such as DHEA?
Zona reticularis
Zona fasciculata
Zona glomerulosa
Adrenal medulla

What common structural precursor serves as the building block from which all cortical hormones are derived?
Cholesterol
Tyrosine
Polypeptides
Glycoproteins

Which physiological class of steroid hormones is primarily responsible for regulating fluid and electrolyte balance?
Mineralocorticoids
Glucocorticoids
Sex steroids
Catecholamines

Which physiological class of steroid hormones regulates glucose production and protein metabolism?
Glucocorticoids
Mineralocorticoids
Sex steroids
Androgens

Which group of steroids is responsible for regulating sexual development and controlling many aspects of pregnancy?
Sex steroids
Glucocorticoids
Mineralocorticoids
Glucocorticoids and mineralocorticoids

What is listed as a major tissue of origin for the sex steroid progesterone?
Adrenal cortex and ovary
Adrenal medulla and testes
Placenta and testes
Pituitary gland and hypothalamus

Which major tissue of origin produces the glucocorticoids cortisol, cortisone, and 11-deoxycortisol?
Adrenal cortex
Adrenal medulla
Ovaries
Testes

Which specific plasma transport protein provides non-specific binding and carries many different steroids?
Albumin
Cortisol-binding globulin
Sex hormone-binding globulin
Transcortin

Which transport protein is responsible for carrying cortisol and its derivatives, as well as progesterone?
Cortisol-binding globulin
Sex hormone-binding globulin
Albumin
Prealbumin

Which transport protein specifically binds and carries testosterone and estradiol in circulation?
Sex hormone-binding globulin
Cortisol-binding globulin
Albumin
Thyroxine-binding globulin

Aldosterone plays a critical role in homeostatic balance by promoting the renal retention of which electrolyte?
Sodium
Potassium
Hydrogen
Magnesium

What pathological mechanism triggers the development of secondary hyperaldosteronism?
Activation of the renin-angiotensin system
An autonomous functioning adrenal tumor
Bilateral adrenal hyperplasia
An ACTH-secreting pituitary tumor

What is the most common underlying cause of primary hyperaldosteronism?
Bilateral adrenal hyperplasia
Adrenal adenoma
Renovascular hypertension
Pituitary adenoma

What specific clinical term is used to describe primary hyperaldosteronism when it is caused by an adrenal adenoma?
Conn syndrome
Cushing syndrome
Addison disease
Waterhouse-Friderichsen syndrome

How does excess aldosterone affect systemic blood pressure through increased sodium reabsorption?
Plasma volume expansion leading to hypertension
Plasma volume depletion leading to hypotension
Direct constriction of peripheral blood vessels
Dilution of blood volume leading to hypotension

What characteristic electrolyte abnormality results from the increased secretion of potassium seen in hyperaldosteronism?
Hypokalemia
Hyperkalemia
Hyponatremia
Hypernatremia

What acid-base disturbance is directly caused by the increased secretion of hydrogen ions in hyperaldosteronism?
Metabolic alkalosis
Metabolic acidosis
Respiratory alkalosis
Respiratory acidosis

Which laboratory evaluation serves as the preferred tool for screening a patient for suspected Cushing syndrome?
Low-dose dexamethasone suppression test
High-dose dexamethasone suppression test
M-dinitrobenzene colorimetric assay
Zimmermann reaction

What is the expected response to a low-dose dexamethasone suppression test in a normal individual compared to a patient with Cushing syndrome?
It suppresses cortisol in normal individuals but fails to suppress it in Cushing syndrome
It suppresses cortisol in Cushing syndrome but fails to suppress it in normal individuals
It causes a sharp spike in ACTH in normal individuals
It has no effect on cortisol levels in either group

A patient with an ACTH-secreting pituitary adenomaexhibits what type of response during a high-dose dexamethasone suppression test?
Suppression of ACTH production and a lowering of serum cortisol
No suppression of ACTH production with cortisol remaining high
A paradoxical increase in both ACTH and serum cortisol
Suppression of cortisol but a severe spike in aldosterone

What happens to serum cortisol during a high-dose dexamethasone suppression test if the condition is caused by ectopic ACTH secretion?
It does not suppress and serum cortisol remains high
It suppresses fully and serum cortisol is lowered
It drops to undetectable levels within one hour
It converts entirely into 17-hydroxyprogesterone

Which laboratory value for ACTH helps differentiate a primary adrenal adenoma from an ACTH-secreting pituitary adenoma?
ACTH is low in primary adrenal adenoma and high in pituitary adenoma
ACTH is high in primary adrenal adenoma and low in pituitary adenoma
ACTH is high in both conditions
ACTH is undetectable in both conditions

Why do patients with hypercortisolism develop muscle weakness with thin extremities?
Cortisol increases muscle breakdown to produce amino acids for gluconeogenesis
Cortisol directly blocks the neural activation of skeletal muscles
Cortisol causes severe localized fluid accumulation in joints
Cortisol completely inhibits the cellular absorption of dietary proteins

What metabolic cascade explains the development of moon faces, buffalo hump, and truncal obesity in Cushing syndrome?
High glucose leading to high insulin, which increases central fat storage
Direct breakdown of subcutaneous lipids in the face and limbs
Inhibition of lipogenesis combined with localized protein expansion
High aldosterone causing severe fluid accumulation in central fat pads

What physical sign in Cushing syndrome is caused by the thinning of skin due to impaired collagen synthesis?
Abdominal striae
Pretibial myxedema
Diffuse goiter
Hyperpigmentation

Why do patients with severe hypercortisolism sometimes display hypertension accompanied by hypokalemia and metabolic alkalosis?
High cortisol exerts the same physiological effects as aldosterone
High cortisol completely down-regulates the renin-angiotensin system
High cortisol directly triggers the destruction of thyroid binding proteins
High cortisol blocks the renal reabsorption of free water

What physiological mechanism drives the development of bilateral adrenal hyperplasia in CAH?
High ACTH resulting from decreased negative feedback
An autonomous hormone-secreting pituitary malignancy
Severe systemic volume depletion triggering aldosterone
Direct autoimmune destruction of the outer cortical layers

What specific enzyme defect is responsible for up to 90% of all cases of congenital adrenal hyperplasia?
21-hydroxylase deficiency
11-beta-hydroxylase deficiency
3-beta-hydroxysteroid dehydrogenase deficiency
17-alpha-hydroxylase deficiency

In the classic form of 21-hydroxylase deficiency, why is steroidogenesis shunted directly towards androgens?
Aldosterone and cortisol pathways are blocked, leaving androgen pathways open
The adrenal gland loses its ability to process cholesterol entirely
High insulin levels directly up-regulate the production of estrogens
The pituitary gland stops secreting ACTH

What life-threatening clinical presentation characterizes the salt-wasting type of classic 21-hydroxylase deficiency in neonates?
Hyponatremia and hyperkalemia with severe hypotension
Hypernatremia and hypokalemia with severe hypertension
Hypercalcemia and metabolic alkalosis with fluid retention
Normal electrolytes with progressive truncal obesity

What diagnostic biomarker is measured during newborn screening to detect congenital adrenal hyperplasia?
Serum 17-hydroxyprogesterone
Serum 11-deoxycortisol
Urine 17-ketosteroids
Plasma renin activity

Which clinical signs serve as the hallmark presentation of acute adrenal insufficiency?
Weakness and shock
Moon faces and truncal obesity
Hypertension and metabolic alkalosis
Pretibial myxedema and exophthalmos

What specific condition is defined as hemorrhagic necrosis of the adrenal glands secondary to severe sepsis and DIC in children?
Waterhouse-Friderichsen syndrome
Conn syndrome
Cushing disease
Hashimoto's thyroiditis

Which infectious organism is most commonly responsible for triggering Waterhouse-Friderichsen syndrome?
Neisseria meningitidis
Staphylococcus aureus
Mycobacterium tuberculosis
Escherichia coli

What are the classic, progressive clinical symptoms that characterize chronic adrenal insufficiency, also known as Addison disease?
Hypotension, weakness, fatigue, nausea, vomiting, and weight loss
Hypertension, truncal obesity, moon faces, and muscle strength
Severe tetany, flaccid paralysis, and rapid weight gain
Exophthalmos, diffuse goiter, and pretibial myxedema

What is noted as a primary pathological cause of progressive adrenal damage leading to Addison disease?
Autoimmune destruction, tuberculosis, or metastatic carcinoma
An ACTH-secreting pituitary microadenoma
A congenital defect in the 21-hydroxylase enzyme
Abrupt withdrawal of prolonged glucocorticoid therapy

What is the primary analytical purpose of performing the Zimmermann reaction?
Measurement of 17-ketosteroids to assess androgen production
Measurement of urine cortisol and its derivatives
Quantitation of total urine estrogen during pregnancy
Screening for newborn congenital adrenal hyperplasia

What primary chemical reagent is utilized in the Zimmermann reaction to produce a measurable color change?
M-dinitrobenzene in alcoholic KOH solution
2,4-dinitrophenylhydrazine
Strong aqueous sulfuric acid with hydroquinone
Dexamethasone in saline solution

What specific wavelength and final product color characterize a positive outcome in the Zimmermann reaction?
Purple color at 520 nm
Yellow derivative at 410 nm
Reddish-brown color at 472 nm
Blue color at 620 nm

What is the clinical testing purpose of the Porter-Silber assay?
Measurement of urine cortisol and derivatives like cortisone and 11-deoxycortisol
Assessment of 17-ketosteroids to evaluate testicular function
Quantitation of maternal serum estriol during late pregnancy
Detection of serum 17-hydroxyprogesterone in neonates

Which chemical reagent is added to a sample during a Porter-Silber assay?
2,4-dinitrophenylhydrazine
M-dinitrobenzene in alcoholic KOH
Sulfuric acid containing hydroquinone
Dexamethasone solution

What measurement wavelength and color result are expected in a positive Porter-Silber assay?
Yellow derivative at 410 nm
Purple color at 520 nm
Reddish-brown color at 512 nm
Green derivative at 340 nm

The Kober reaction is highly sensitive and specifically used to detect and quantitate which urine hormone parameter?
Total urine estrogen during the middle and latter stages of pregnancy
Urine cortisol derivatives during acute adrenal crisis
Urine 17-ketosteroids to evaluate bilateral adrenal hyperplasia
Plasma aldosterone levels in suspected Conn syndrome

What specific combination of chemicals forms the primary reagent in the Kober reaction?
Strong aqueous sulfuric acid solution containing hydroquinone
M-dinitrobenzene in an alcoholic potassium hydroxide mix
2,4-dinitrophenylhydrazine in distilled water
Dexamethasone and m-dinitrobenzene combined

What distinct color is evaluated at wavelengths 472, 512, and 556 nm during a Kober reaction?
Reddish-brown color
Purple color
Yellow derivative
Bright blue derivative