So post ganglylionic cells carry those electric signals and extend to the effect their organ, whatever it might be. It could be a muscle, it could be some type of organ, it could be a tissue and so forth. So let's take a look at the following simple reflex arc. And let's follow our electric signal as it begins on one part of the body and ascends somewhere else. So let's suppose we take our finger and we pinch or we take a prick and we prick our finger and let's see what happens. So on our finger, let's say we apply pressure.