Sunlight is known to lower blood pressure, but
now a team of British researchers has figured out why.
What they found is that nitric oxide stored in
the top layers of the skin reacts to sunlight and causes blood
vessels to widen as the oxide moves into the bloodstream. That, in
turn, lowers blood pressure.
"This is an unexpected finding, in that
the skin has not been considered to be involved in blood pressure
regulation," said lead researcher Martin Feelisch, a professor
of experimental medicine and integrative biology at the University of
Southampton.
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