The hypothalamus and adrenal glands regulate blood vessel changes in the skin in response to temperature or stress, respectively.
The hypothalamus and adrenal glands play crucial roles in regulating changes to the blood vessels of the human skin. The hypothalamus, sensing temperature changes, signals the dilation or constriction of skin blood vessels to release or conserve heat, respectively. In response to stress or danger, the adrenal glands produce epinephrine and norepinephrine, triggering vasoconstriction in skin blood vessels to prioritize blood flow to vital organs during the 'fight-or-flight' response.
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