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The atrial wall of the human heart secretes a very important peptide hormone. What is the name of that hormone? 

(a) GIP

(b) ANF

(c) ADH

(d) CCK

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(b) ANF 

The atrial wall of the human heart secretes Atrial Natriuretic Factor (ANF) or Atrial Natriuretic Peptide (ANP) hormone. Its main function is to cause a reduction in Extra Cellular Fluid (ECF) volume by increasing renal sodium excretion.

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