This video, we're going to begin our introduction to cell communication. Cells of the immune system must be able to communicate with each other in order to coordinate attacks on invading microbes. Cell communication is critical, especially for the innate scanning systems to be able to detect signs of microbes and to detect signs of host cell damage, as well as for the innate scanning systems to be able to communicate to other cells to alert and activate other immune components. Notice that we're showing you our map of the lesson on cell communication, which is down below right here, specifically focusing on cell communication on the left-hand side. There are three important components for cell communication, and those three important components are numbered down below right here. They are cell surface receptors, adhesion molecules, and cytokines. As we move forward in our course talking more about cell communication, we'll get to talk more about each of these different components in more detail.
Notice we're showing you our map of the lesson on innate immunity. We've already discussed the first line defenses, and we're currently talking about the second line defenses, which include the cells of immunity that we talked about in our previous lesson videos. Remember that the second line defenses are broken up into the scanning systems, which serve to detect signs of microbes and serve as security cameras, and it also includes the innate effectors and the innate effector actions which act as security soldiers. Now we'll talk about the innate effector actions later in our course. For now, we're focusing on the scanning system.
We're going to talk about cell communication first, and the three components of cell communication, which, once again, are going to be surface receptors, which are these little receptors here that are capable of detecting signs of microbes and things of that nature. It's also going to include adhesion molecules, which we'll get to talk more about as we move forward in our course. And it is also going to include cytokines. After we've finished discussing cell communication and all three of these components, then we'll move on to talk about pattern recognition receptors, and then we'll talk about the complement system. And then finally, we'll move on to the innate effector actions. This here concludes our brief introduction to cell communication. We'll be able to talk a lot more about these different components as we move forward in our course. So, I'll see you all in our next video.