Conclusion: The changes of circadian variation of blood pressure are associated with the role of sympathetic nerve and intracardial renin angiotensin system.

结论血压昼夜变化交感神经与肾素血管紧素系统等双重作用有关。

Renin, a proteolytic enzyme formed in the granules of the juxtaglomerular apparatus cells, catalyzes conversion of the protein angiotensinogen to angiotensin I, a decapeptide.

肾素是肾小球胞颗粒内形成的一种蛋白水解酶，催化蛋白血管紧素原转换为血管紧素Ⅰ，即十肽。