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NEET 2017 · BiologyPrevious Year Question

A decrease in blood pressure/volume will not cause the release of

Answer: (B) Atrial Natriuretic Factor. Answer: (B) Atrial Natriuretic Factor (ANF).

  1. A.Renin
  2. B.Atrial Natriuretic Factor✓
  3. C.Aldosterone
  4. D.ADH

Correct Answer

(B) Atrial Natriuretic Factor

Solution & Explanation

Answer: (B) Atrial Natriuretic Factor (ANF). Solution: A fall in blood pressure/volume triggers the renin-angiotensin system (renin from JG cells, then angiotensin II, then aldosterone) and ADH release to conserve water and raise BP. ANF works oppositely: it is released when blood flow/volume to the atria INCREASES, causing vasodilation to lower BP. Hence a DECREASE in BP/volume will not cause ANF release. NCERT Reference: Ch 16, p.212, lines 33-35 — "An increase in blood flow to the atria of the heart can cause the release of Atrial Natriuretic Factor (ANF). ANF can cause vasodilation (dilation of blood vessels) and thereby decrease the blood pressure."

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