We've talked about one the main concepts in physiology being homeostasis, that is 'how do you maintain a constant internal environment?

我们讲到了生理学的主要概念,内稳态,即如何维持内环境的稳定

耶鲁公开课 - 生物医学工程探索课程节选

So, these are all involved with our ability to maintain homeostasis by exchanging materials with the external environment.

这个过程关乎人体维持内稳态的能力,内稳态通过与外环境进行物质交换来实现

耶鲁公开课 - 生物医学工程探索课程节选