Now, once the calcium is released into our surroundings, into the cytoplasm of the cell, they will go on. The calcium ions will go on and bind to a special region on the thin filament, as we'll see in just a moment. Now, by the way, this junction between the axon terminal and the membrane of our muscle cell is known as the neuromuscular junction, and it's also sometimes known as the motor and plate. So if you ever hear the expression motor and plate, that simply is referring to the synapse between our end of the motor neuron and our sarcoplasm of our muscle cell. This is also known as the neuromuscular junction. So now that we know how the signal actually arrives onto our muscle cell and what it causes, let's see what the calcium actually does and how it interacts with the thin and thick filament.