Intermediate Adrenal Medulla Quiz
Ready to start the quiz?
This quiz contains 10 questions. Click below to begin.
Q1. Which neurotransmitter is released by preganglionic sympathetic fibers onto adrenal chromaffin cells?
- Acetylcholine
- Norepinephrine
- Dopamine
- Cortisol
Q2. Which receptor type on chromaffin cells mediates direct preganglionic sympathetic stimulation?
- Beta-2 adrenergic receptors only
- Nicotinic acetylcholine receptors
- Mineralocorticoid receptors
- Muscarinic receptors exclusively
Q3. Through which nerves do preganglionic sympathetic fibers reach the adrenal medulla?
- Thoracic splanchnic nerves
- Phrenic nerves exclusively
- Pelvic splanchnic nerves
- Vagus nerves exclusively
Q4. What is unusual about the sympathetic pathway to the adrenal medulla?
- All fibers synapse first in the celiac ganglion
- Only postganglionic fibers enter the gland
- The pathway is entirely parasympathetic
- Preganglionic fibers reach chromaffin cells without a prior ganglionic synapse
Q5. How are chromaffin cells typically arranged histologically?
- Clusters or cords around sinusoidal capillaries
- Follicles filled with colloid
- Long skeletal muscle fascicles
- Keratinized sheets
Q6. What is the role of the rich sinusoidal network in the adrenal medulla?
- Rapid entry of catecholamines into blood
- Storage of urine
- Production of cerebrospinal fluid
- Mechanical filtration of lymph
Q7. What is the main venous channel within the adrenal medulla?
- Renal arcuate vein
- Portal vein
- Inferior mesenteric vein
- Central adrenal vein
Q8. Which structural feature is characteristic of the central adrenal vein?
- Cartilage rings
- Stratified squamous epithelium
- Skeletal muscle valves
- Longitudinal smooth muscle bundles
Q9. How does blood from the adrenal cortex influence the medulla?
- It carries urine into the medulla
- It delivers glucocorticoids to chromaffin cells
- It blocks medullary catecholamine synthesis
- It supplies only lymphocytes
Q10. Which enzyme in chromaffin cells is stimulated by high local glucocorticoid concentrations?
- Acetylcholinesterase
- Aldosterone synthase
- Renin
- Phenylethanolamine N-methyltransferase