Outward changes, such as a flush or a pallor, caused by the contraction of dilation of blood vessels, which is in turn caused by a stimulus to nerves which control the muscular walls of the blood vessels. This is what occurs in a hot flash.
Outward changes, such as a flush or a pallor, caused by the contraction of dilation of blood vessels, which is in turn caused by a stimulus to nerves which control the muscular walls of the blood vessels. This is what occurs in a hot flash.
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