Endocrine system — A/L Biology

How do I practise Endocrine system?

1 question with a worked solution

1. Which hormone is secreted by the adrenal cortex to stimulate sodium reabsorption and potassium excretion in the distal convoluted tubules of the kidney?
   1. A) Cortisol
   2. B) Aldosterone
   3. C) Atrial natriuretic peptide (ANP)
   4. D) Antidiuretic hormone (ADH)
   Check my answer

   Correct answer: B) Aldosterone

   Aldosterone is a mineralocorticoid secreted by the adrenal cortex (zona glomerulosa) that acts on the distal tubules and collecting ducts of the nephron to stimulate Na⁺ retention and K⁺ excretion, regulating blood volume and pressure.

   Show worked solution

   Step 1: Identify hormone origin: adrenal cortex mineralocorticoid. Step 2: Cortisol is a glucocorticoid regulating metabolism and stress. Step 3: ADH is synthesized in hypothalamus and released by posterior pituitary. Step 4: Aldosterone directly mediates Na⁺/K⁺ balance in the distal nephron. Answer: Aldosterone.
   Modelled on: the A/L Biology examination pattern

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Where does Endocrine system fit in the syllabus?

Year 2 · Term 1