Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 5 of 99
The systemic concentration of \(\text{Na}^+\) ions in human extracellular fluid is regulated by which steroid hormone?
A
Aldosterone
B
Parathormone
C
Antidiuretic hormone (ADH)
D
Estrogen
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Aldosterone
Concept: Endocrine control of renal electrolyte balance.

Solution: Aldosterone, secreted by the adrenal cortex, acts on the distal convoluted tubules and collecting ducts to promote active reabsorption of \(\text{Na}^+\) into the blood.

Why other options are incorrect:
  • Option B (Parathormone): Regulates calcium (\(\text{Ca}^{2+}\)) and phosphate levels.

  • Option C (ADH): Regulates free water reabsorption by altering aquaporin channels.

  • Option D (Estrogen): Female sex hormone involved in reproductive cycles.

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