Intermediate Zona Glomerulosa Quiz
Ready to start the quiz?
This quiz contains 10 questions. Click below to begin.
Q1. Which enzyme is characteristic of terminal aldosterone synthesis in zona glomerulosa cells?
- Tyrosine hydroxylase
- PNMT
- Aldosterone synthase
- Renin
Q2. Which steroidogenic enzyme activity is notably absent or very low in zona glomerulosa cells?
- 3-beta-hydroxysteroid dehydrogenase
- Aldosterone synthase
- Cholesterol side-chain cleavage enzyme
- 17-alpha-hydroxylase
Q3. Which angiotensin peptide directly stimulates zona glomerulosa cells to secrete aldosterone?
- Angiotensin I only
- Angiotensin II
- Angiotensinogen
- Bradykinin
Q4. Which receptor mediates the major direct action of angiotensin II on zona glomerulosa cells?
- Nicotinic acetylcholine receptor
- Beta-1 adrenergic receptor
- AT1 receptor
- Melanocortin 2 receptor exclusively
Q5. How does elevated extracellular potassium stimulate zona glomerulosa cells?
- Membrane depolarization and increased intracellular calcium
- Complete membrane hyperpolarization
- Inhibition of all calcium entry
- Activation of skeletal muscle contraction
Q6. What type of capillaries are associated with zona glomerulosa and the rest of the adrenal cortex?
- Fenestrated sinusoidal capillaries
- Avascular connective tissue channels
- Lymphatic vessels only
- Blood-brain barrier capillaries
Q7. From where does blood enter the superficial adrenal cortex near the zona glomerulosa?
- Central adrenal vein
- Portal venous sinus
- Subcapsular arterial plexus
- Renal pelvis
Q8. What is the general direction of blood flow from the zona glomerulosa through the adrenal cortex?
- Directly into the peritoneal cavity
- Inward toward deeper cortex and medulla
- Into the renal collecting system
- Outward from the medulla only
Q9. How does ACTH compare with angiotensin II as a regulator of zona glomerulosa function?
- ACTH has a secondary role compared with angiotensin II and potassium
- ACTH completely suppresses aldosterone
- ACTH is the only regulator of aldosterone
- Zona glomerulosa has no hormonal regulation
Q10. Which intracellular organelles are prominent in zona glomerulosa cells because they synthesize steroids?
- Keratin bundles and cartilage
- Large mucin granules only
- Cilia and myofibrils
- Smooth endoplasmic reticulum and steroidogenic mitochondria