Question

Explain the heart’s role in secreting a hormone that regulates renal function? What hormone is this?

Answer 1

The cardiac atrial cells secrete atrial natriuretic peptide or factor. It travels to the kidney and increases blood flow to the glomerulus. It acts as vasodilator on the afferent arteriole and vasoconstrictor on efferent arteriole. It decreases aldosterone release for the adrenal cortex and decreases the release of renin Angiotensin-II. Health of the heart depends on the normal blood pressure and hence evolution might have preserved atrial natriuretic factor which acts upon the renal function.

Answer 2

• Excessive stretch of cardiac atrial cells cause an increase in blood flow to the atria of the heart and release Atrial Natriuretic Peptide or factor (ANF) travels to the kidney where H increases Na+ excretion and increases the blood flow to the glomerulus.
• Acting on the afferent glomerular arterioles as a vasodilator or an efferent arterioles as a vasoconstrictor.
• The first identical natri uretic hormone is atrial natriuretic horome of heart.