So, so far we see many of the different structures that are found in skeletal muscles are also found in cardiac muscle cells. Now the next important difference between our cardiac muscle cell and the skeletal muscle cell is the fact that cardiac muscle cells are actually connected to one another. So if we have one cardiac muscle cell, a second cardiac muscle cell will be found right next to it and these two will be connected by regions called intercollated discs. Now intercollated discs are basically these connecting regions that contain two important types of junctions. One of these junctions is known as a gap junction. And what the gap junction is, it's basically this channel that connects one cell to the JSON cell and this channel allows for a quick and uniform propagation of the action potential from one cell to the next cell because it allows the movement of ions between adjacent muscle cells.