为了保存肌肉所需要的血液，皮肤血管收缩，而肌肉血管舒张。
To conserve blood that will be needed by muscles, skin vessels constrict while vessels of the muscles dilate.
随着年龄的增长，皮肤的保护性反应——表层血管的收缩减慢，对低温的反应可以增加代谢率，可老年人的代谢率却在不断减弱，哪一代谢机体的下降却不明。
The skin's protective reaction of constricting surface blood vessels is slower with age, and the cold-induced rise in metabolic rate is also weakened in older people, but the mechanism is unknown.
她说，当人们变得紧张或有压力时，他们的外周血管会收缩，进而使皮肤冷却。
When people become tense or stressed, their peripheral blood vessels contract, cooling the skin, she said.
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