How do your kidneys know what the status is of inside your blood, They know that because they receive signals from the endocrine system and the nervous system.

肾脏何以得知血液组分的状态,它们能够知道这些是因为它们接收到,来自内分泌系统和神经系统的信号

耶鲁公开课 - 生物医学工程探索课程节选