So let's discuss what each one actually looks like, what it is composed of, and what the function of each type of junction is. And let's begin by examining the tide junction. So tide junctions basically form watertight seals or watertight connections between adjacent cells. And what this basically means is molecules and ions cannot actually get around cells. They must actually pass through that cell to get from one side, the lumen side, to the other side, our extracellular fluid side. So basically, this means that in order for things like water to actually get past one side of the cell, the lumen cavity, to the other side of the cell, the extracellular fluid, something actually must pass through the cell membrane on the lumen side and to the cell membrane on the extracellular side.