But the way to get more long-term control of blood pressure is to alter the blood volume, and for that, you need the kidneys.

但是更长期控制血压的方法是改变血容量，为此，你需要肾脏。

The juxtaglomerular cells then receive the signal and also independently sense the low pressure in the blood vessels and secrete an enzyme called renin which increases sodium reabsorption which helps raise the blood volume.

球旁细胞接收信号，同时也可感受血管低血压，并分泌一种叫肾素的酶，而肾素能增加钠的重吸收，从而能增加血容量。