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。
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