‘ANF’ is secretes by
a)	Venous wall of heart	b)	Atrial wall of heart	c)	Both (a) and (b)	d)	None of these

(b)

The atrial wall of our heart secretes very important peptide hormone called Atrial Natriuretic Factor (ANF), which is peptide in nature. ANF decreases blood pressure. When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels. This reduces the blood pressure