So we have many of these myofibrils. And if we examine one of these myofibrils and we zoom in on the myofibril, we basically get the following diagram. So, we have many of these sarcomeres connected end to end to form our myofibility. 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.