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. And we'll discuss these chemicals in detail when we'll discuss these in the next several lectures. Now the final type of pathway is our endocrine signaling pathway. This is the pathway that is actually used by the endocrine system.