The video shows a diagram of a human body from the back, focusing on the lungs. The diagram is colorful, with the lungs in red and the trachea in blue. The diagram is labeled with the names of the parts of the respiratory system, including the nose, mouth, trachea, lungs, and diaphragm. The video shows the trachea opening and closing, and the lungs expanding and contracting. The diagram is detailed and precise, with clear labels and accurate depictions of the respiratory system.