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Regulating the renal function

What do you know about an evolutionary explanatory hypothesis for the secretion by the heart of hormone which regulates the renal function? Name that particular hormone?

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The renal regulator hormone which is released by the heart is the atrial natriuretic factor (or ANF). The ANF improves the excretion of sodium in nephron tubules resulting in the less reabsorption of the water, more urinary volume, and therefore, lowering the blood pressure. The atrial natriuretic factor is released whenever there is an increase of length of the heart muscle fibers in response to the high blood pressure. The ANF is a natural antihypertensive substance. As, the health of heart depends mainly on the stability of normal blood pressure the evolution must have preserved the atrial natriuretic factor in order to allow information from the heart to be an additional mechanism for renal control of blood pressure.

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