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.
血压：血液作用于血管壁的压力，产生于心脏的泵推作用。血管的舒张和收缩对维持血液的流动有所帮助。
Blood pressure: Force originating when the heart's pumping pushes the Blood against the walls of the Blood vessels. Their stretching and contraction help maintain Blood flow.
较大剂量时，也能舒张外周阻力血管和心肌阻力血管从而降低血压，还可以间接地增强心肌收缩力。
If large doses are used, they can diastole outside resistant blood vessels and myocardial resistant vessels and they can reduce blood pressure and also indirectly enhance myocardial systole.
方法以离体兔主动脉条观察该三种血管舒张药对氯化钾、去甲肾上腺素量效曲线及预收缩血管的影响。
Methods The effects of three vasodilators on the potassium chloride, norepinephrine concentration-response curves and precontracted rabbit aorta were investigated.
方法采用高分辨力超声无创性检测血管内皮依赖性舒张功能的方法比较收缩期和舒张期高血压（SDH）与正常血压组血流介导性舒张（FMD）与反应性充血的血管内皮依赖性舒张功能。
Methods A non-invasive high-resolution ultrasound was used to detect the flow-mediated dilatation (FMD) and the change of blood flow volume of reactive hyperaemia in SDH and the control.
其具有双向调节脑血管痉挛收缩和舒张的作用，对血管神经性头痛具有显 著的疗效。
The medicine combination can regulated the contraction and the relaxation of cerebral vasospasm in bidirectional way and has significant curative effect on the angioneurotic headache.
其具有双向调节脑血管痉挛收缩和舒张的作用，对血管神经性头痛具有显 著的疗效。
The medicine combination can regulated the contraction and the relaxation of cerebral vasospasm in bidirectional way and has significant curative effect on the angioneurotic headache.
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