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Answer: 1. Atrial Natriuretic Factor

Key idea: A fall in blood pressure or volume triggers hormones that raise it; ANF does the opposite.

  • Low pressure activates the JG cells to release renin, leading to angiotensin II and then aldosterone (more \(\mathrm{Na^+}\) and water retained).
  • Low volume also makes the posterior pituitary release ADH to save water.
  • Atrial Natriuretic Factor is released by the atria when blood pressure or volume rises; it causes vasodilation and sodium loss.

So ANF is the one not released. Answer: (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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