29. What is an evolutionary
explanatory hypothesis for the
secretion by the heart of a
hormone that regulates the
renal function? Which is that
hormone?

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The renal regulator secreted
by the is the atrial
factor (or ANF). ANF increases the
of sodium in nephron
tubules causing resorption of water,
urinary volume, and lowering
the blood . The atrial natriuretic
is secreted when is an
increase the length of heart
muscle fibers response to high
pressure. The ANF a natural
antihypertensive . Since the
health the heart depends
upon the stability the normal blood
the evolution should
preserved the atrial factor to
allow from the heart be
an additional for the renal
of the blood .