And that allows the quick movement of the action potential from one cell, the presynaptic neuron, to the other cell that postsynaptic neuron. Now let's move on to function number two, cell nourishment. So every single cell in our body needs things like glucose, amino, amino acids, nucleotides, to actually survive and function correctly. Now, not all of these cells actually are found next to capillaries. And that means not all cells in our body can actually directly obtain the nutrients they need from the body. And that's where these gap, from the capillaries and that's where these gap junctions actually come into play.