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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 Solution: Atrial Natriuretic Factor (ANF) is secreted by the atrial wall of the heart when blood pressure is increased; it dilates blood vessels and lowers BP.

  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 Solution: Atrial Natriuretic Factor (ANF) is secreted by the atrial wall of the heart when blood pressure is increased; it dilates blood vessels and lowers BP. A decrease in blood pressure/volume triggers renin (from JG cells), aldosterone and ADH to conserve Na+/water and raise BP, but it does NOT release ANF. Hence ANF is the exception. NCERT Reference: Chapter 19, Page 247, Line(s) 14-17 — "the atrial wall of our heart secretes a very important peptide hormone called atrial natriuretic factor (ANF), which decreases blood pressure. When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels."

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