A red line represents a pulmonary artery in this image. It is located on the left side of the body, and is not visible from the front view. The image depicts a detailed diagram of the lungs with the right and left lung separated by a thick black line. The left lung has one branch while the right lung has three branches, each ending in a small lobe. The top part of the image shows an outline of the trachea and bronchi, with air passing through them to reach the lungs. The middle section of the image shows the lungs themselves, each lung surrounded by a thin black line. The red artery is located at the top of the left lung, just above the air sacs. The bottom part of the image shows the diaphragm, which separates the thoracic cavity from the abdominal cavity. This image clearly illustrates the structure of the lungs and their connection to other organs.

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