 So far we've looked at two themes in physiology, structure determines function, function is physio, and body systems work together to maintain homeostasis. That brings us like directly into our third theme, which is if you're going to work together to maintain homeostasis, you got to communicate. And this is, you can think about your anatomical experience, and you can come up with some very solid examples of how body systems might communicate with each other. The first communicating system that I think of is the nervous system, the second one is the endocrine system. And in fact, lecture number three in this series is all about how the body systems tools mechanisms that the body systems use to communicate with each other. So we're going to see it over and over again. There's all sorts of messages being sent, messages being received, action being carried out based on those messages, and all of it is coordinated, and it's pretty incredible when you think about it. I mean, it's a daily thing that I am going through human physiology just with my mind blown at how complex and coordinated and lovely the whole thing is. So let's talk about those organ systems because we know that they work together, we know they have to communicate with each other, we know they maintain homeostasis. Let's just do a brief overview of like how, how do they maintain homeostasis, what are they doing, what? This is like a fast, super fast like crazy speed through the course, but that doesn't mean that you don't finish the course, you have to finish the course. Can't be right back.