[MUSIC] In this unit we're going to talk about homeostasis, and homeostasis is is, is how we keep our body within physiological limits. And so, there are things like our body temperature, blood glucose the amount of, of hydration. So, amount of water that we have in us. Our energy balance, the, the balance between eating and exercising. How much energy, how much growth we have, etc. This are all forms of homeostasis, and that may sound like it's all very automatic and it just sort of happens unless something goes wrong. But, in fact, we contribute to homeostasis through our voluntary actions. And so what we're going to do today is we're going to or in this unit, is we're going to look at what homeostasis is. We're going to look at the homeostasis that involves the hypothalamus. And this is pretty much the classical form of homeostasis. But then we're going to look at less classical forms of of, homeo, a less classical view of homeostasis. So, things like how homeostasis may contribute to disorders such as postpartum depression. We'll take a look at thermoregulation. Emptying your bladder, breathing, and sleep/wake cycle. And these are all examples of places where there's a combination of autonomic nervous system involvement and skeletal muscle involvement, and a lot of mood and motivation that contributes to homeostasis as well. In the, the beginning of homeostasis, the beginning of the idea of homeostasis was really advanced by Walter Cannon in this book, The Wisdom of the Body, which was published about a century ago. I think a little over a century ago. The, the classical view focuses in on the hypothalamus. And then the next segment, we'll look at the classical view of homeostasis. [MUSIC]