Expansion and contraction of blood vessels of normal blood flow is essential.
血管的扩张和收缩对血液的正常的流动是必需的。
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.
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。
I think, for the peripheral vessels, repair may be no problem, but for the myocardium this has trouble because the myocardium has its own potential for conduction and contraction.
我认为对外周血管而言，修复不成问题，但对心肌有很大问题，因为心肌有潜在的传导和收缩功能。
This leads to subtle changes in the autonomic nervous system, which controls the contraction and relaxation of these vessels.
他还说，这会招致节制血管缩短和放松地自立神经系统发生奇妙转变。
This leads to subtle changes in the autonomic nervous system, which controls the contraction and relaxation of these vessels.
他还说，这会招致节制血管缩短和放松地自立神经系统发生奇妙转变。
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