So these are our examples of our gap junctions. For example, if calcium ions want to get from this cell to this cell, they could move via these intracellular connections known as gap junctions. Now, what's a particular example of a cell that contains gap junctions? Well, it's basically a special type of muscle cell known as the cardiac cell, the cells found in our heart. So gap junctions are found in muscle tissues such as cardiac cells, and there they play an important role in allowing calcium ions to move across our cells, which basically propagates the action potential from one cell to the next cell. And this ultimately causes the heart to contract and that creates our heartbeat, which pumps our blood through the body.