That cell releases that chemical into the extracellular fluid and then that chemical binds onto that same cell that release that chemical and creates some type of change. And some examples of this will be seen in the immune system when we'll discuss the immune system of the human body. Now the second type of signaling pathway is our paracrine signaling pathway. And in this case, our cell creates a chemical. That chemical is released into the extracellular fluid and then that chemical travels to nearby cells, to cells found in close proximity and affects those cells. And one example of such a chemical is the prostaglandin.