And then some type of ion can flow across that membrane from one side to the other side. In this case, let's say it's from the outside to the inside of the cell. So this is the sodium ion flowing in this direction. Now, there are many examples of ligand gated ion channels inside our body. And the one that we're going to take a look at in a future electri is the acetylcholine receptor that we basically find on the postsynaptic membranes of cells found within the neuron pathway. So let's suppose this is the presynaptic neuron cell and this is the postsynaptic cell and this is the membrane of the post synaptic cell.