Advanced Zona Glomerulosa Quiz

Q1. Why does the zona glomerulosa normally produce aldosterone rather than cortisol?

• It cannot use cholesterol
• It lacks mitochondria
• Its zonal enzyme profile favors mineralocorticoid synthesis
• It contains only catecholamine enzymes

Q2. What is the principal signaling consequence of AT1 receptor activation in zona glomerulosa cells?

• Gs signaling eliminates intracellular calcium
• Gq-mediated signaling increases intracellular calcium
• Nicotinic signaling releases catecholamines
• Nuclear thyroid receptors produce aldosterone directly

Q3. Why can hyperkalemia stimulate aldosterone even when circulating renin is low?

• Potassium must first be converted to angiotensin II
• Potassium directly stimulates glomerulosa cells through depolarization and calcium entry
• Aldosterone secretion cannot occur without high renin
• Potassium stimulates only the adrenal medulla

Q4. How does aldosterone synthase expression help define functional zona glomerulosa tissue?

• CYP11B2 marks cells capable of terminal aldosterone synthesis
• CYP11B2 identifies chromaffin cells
• It marks only cortisol-producing fasciculata cells
• It is a structural collagen protein

Q5. Why is the zona glomerulosa relatively preserved during prolonged ACTH suppression?

• It has no endocrine activity
• It receives no blood supply
• It is part of the adrenal medulla
• Angiotensin II and potassium provide major regulatory support independent of ACTH

Q6. What structural change can occur in the zona glomerulosa with chronic stimulation of the renin-angiotensin system?

• Complete loss of cortical cells
• Conversion into chromaffin tissue
• Transformation into renal tubules
• Increased activity with possible glomerulosa hyperplasia

Q7. Why can an aldosterone-producing cortical adenoma cause systemic effects despite being anatomically small?

• Aldosterone enters the bloodstream and acts on distant target organs
• Aldosterone remains confined to the adrenal capsule
• The tumor drains directly into the urinary collecting system
• The tumor sends motor axons to the kidney

Q8. How does the subcapsular position of the zona glomerulosa relate to adrenal vascular organization?

• It lies next to the arterial plexus feeding cortical sinusoids
• It surrounds the central adrenal vein
• It receives blood only after the medulla
• It lies outside all adrenal vessels

Q9. What developmental feature distinguishes adult cortical zonation from the fetal adrenal cortex?

• Adult cortical zones are fully unrelated to developmental remodeling
• The fetal zone becomes the entire adrenal medulla
• Postnatal remodeling establishes the adult cortical zones
• The adrenal cortex disappears after birth

Q10. Which statement best integrates zona glomerulosa anatomy and function?

• It is an avascular fibrous layer without endocrine function
• It is a subcapsular steroidogenic zone specialized structurally and biochemically for regulated aldosterone secretion
• It is the thick middle cortical zone primarily producing cortisol under ACTH control
• It is neural crest-derived medullary tissue producing catecholamines