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.
在出现严重中暑时，血压下降，心脏试图增加输氧量，与此同时心跳和呼吸都会加快。低血压会导致血管收缩，严重时皮肤会发白或发青。
In the case of severe heat stroke, heart rate and respiration rate will increase as blood pressure drops and the heart attempts to supply enough oxygen to the body.
血液流过皮肤来调节体温-血管根据外部条件的变化扩张和收缩。
Body temperature is regulated by blood flow through the skin - vessels dilating and constricting with changing external conditions.
本病的基础是因正常血管反应的局部缺陷而导致的指(趾)动脉和皮肤小动脉的异常血管收缩。
Abnormal vasoconstriction of digital arteries and cutaneous arterioles due to a local defect in normal vascular responses is thought to underlie the disorder.
你的血管可能扩张。这使得皮肤变红。喉和肺部的气管可能收缩，使呼吸变得困难。
Your blood vessels may expand. This causes the skin to become red. air passages in the throat and lung may shrink. This makes breathing difficult.
可净化皮肤，平衡肌肤油脂分泌，排毒，消除黑头粉刺，收缩微血管，另外可消除疲劳，预防感冒，并有助于呼吸道问题的改善。
Clean skin, balance grease excretion, help to release rubbish, eliminate comedo and acne, shrink capillary, also could dispel tiredness, defend cold virus and is good for improving breathing problems.
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;
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;
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