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Atrial Natriuretic Factor (ANF) is released by the

AAdrenal cortex when sodium falls low
BHypothalamic neurosecretory cells
CJuxtaglomerular apparatus in kidney
DAtrial walls when stretched by volume
Answer & Solution
Correct answer: D. Atrial walls when stretched by volume
ANF is secreted by atrial myocytes in response to atrial wall stretch (volume overload). It promotes vasodilation and Na+/water excretion, opposing the RAA system and lowering blood pressure.
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