Up next, we have two systems that provide communication and integration, the nervous system and the endocrine system. And these two systems are most responsible for maintaining homeo stasis in the body. And homeostasis is the maintenance of a stable internal environment. We're not gonna spend a lot of time talking about homeostasis right now, but we're gonna spend a lot of time talking about it going forward. So when we do, you want to keep in mind how these systems function. So both the nervous system and the endocrine system provide communication, but they do it very differently. We'll start with the nervous system. The nervous system is comprised of the brain, the spinal cord and all the nerves of the body and sometimes will include the special senses of the body as well. The nervous system does its communication and integration through rapid communication and integration using electrical signals. When I think of the nervous thinking system, I think of direct point to point communication very, very quickly. If I touch something, a message goes up to my brain and I feel it what feels like to me instantly, it's almost instantly if I want to move a muscle, a signal goes from my brain. It goes to the very specific muscle and my arm moves in a very specific way that's rapid communication using electrical signals. That's in contrast to the endocrine system. The endocrine system is gonna be made of all these different glands. And you don't need to know all the different glands right now. But just know that the endocrine system is made of endocrine glands. These endocrine glands are really good at providing whole body coordination and communication and they do it using chemical messages, messengers called hormones. The endocrine system works by making hormones and putting them into the blood. These chemicals then go through our body because our blood goes everywhere in our body. So the messages from the endocrine system go everywhere. Now, not every cell responds to the message, different cells respond differently and it can take a little while for the blood to get everywhere and for all those responses to happen. So the endocrine, unlike the nervous system will often take well, at least usually minutes for a response to happen. And, and more often in the timeline of hours or maybe even days to finish this off. I'll just give you a little analogy if I think about sending out messages to my friends or people on my college campus. Right? I have a couple of ways that I could do it if I need to send a, send a very specific message to just a few people. I'm gonna send a text message. Right. I'll send them a text message. They'll arrive on their phone immediately. They see it right away. Direct point to point communication, using electrical signals. That is the nervous system. On the other hand, I could put flyers up all over campus announcing something. Everybody is gonna see it. Not, everyone's gonna care different. People are gonna respond differently and it's gonna take them a little longer for everybody to see it. That's much more like the endocrine system. All right, with that, we have two more systems down and I'll see you in the next video.
