Physiology All of these are actions of Atrial Natriuretic Peptide except: A Afferent arteriole dilation B Mesangial constriction C Decreased sodium absorption in PCT D Inhibition of sodium reabsorption in medullary collecting duct 💡 Explanation All of these are actions of Atrial Natriuretic Peptide except: ✓ Correct Answer: B. Mesangial constriction