肾素-血管紧张素系统作用机制的第一步是肾近球细胞受到低血压、交感神经兴奋、低血容量及低钠流量的刺激而分泌肾素。
The first step in the RAS cascade is the secretion of the enzyme renin by renal juxtaglomerular cells in response to low blood pressure, sympathetic activation, hypovolemia, and low sodium flux.
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