急性失交感神经支配的皮肤或者肢端由于失去了交感性缩血管神经紧张作用，皮肤是温暖的。

In acutely sympathetically denervated areas, the skin or extremity is warm because of loss of sympathetic vasoconstrictor tone.

youdao

急性缺氧时，皮肤、腹腔内脏交感神经兴奋，缩血管作用占优势，故血管收缩；

When acute anoxia, the skin, the abdominal cavity internal organs nerve is excited, shrinks the blood vessel function to get the advantage, therefore vasoconstriction;

youdao