EDAIC part-1: Questions with simplified explanations. FREE UPLOADS BY WWW.TARGETEDAIC.COM (39)

The section, EDAIC part-1: Questions with simplified explanations, covers a different topic each day with the intent that candidates can prepare one small topic each day, making steady progress in their exam preparation.

Question: Identify true statements regarding adrenal glands

1. Zona fasciculata forms the bulk of the cortex
2. ACTH and cortisol levels are at their lowest in the morning soon after waking
3. Approximately 90% of adrenal medulla cells are epinephrine secreting
4. Cortex and medulla have different embryonic origins
5. Venous drainage is via a single adrenal vein bilaterally

Answers:

1. true
2. false
3. true
4. true
5. false

Explanation:

• Histologically, the adrenal cortex comprises three distinct layers
  • outer zona glomerulosa
  • middle zona fasciculata (largest layer)
  • inner zona reticularis
• ACTH and cortisol levels are highest in the morning soon after waking
• Approximately 90% of adrenal medulla cells are epinephrine secreting
• The adrenal cortex and medulla have distinct embryological origins. The medullary portion consists of chromaffin cells derived from the ectodermal cells of the neural crest. The cortex is of mesodermal origin.
• Venous drainage is via a single adrenal vein into the renal vein on the left and the inferior vena cava on the right

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The ‘EDAIC part-1: Questions with simplified explanations’ section covers a different topic each day with the intent that candidates can prepare one small topic each day, making steady progress in their exam preparation.