The video shows a close-up of red blood cells moving through a blood vessel. The red blood cells are biconcave discs, which means they have a flattened shape with a central pore. They are a deep red color, and the background is a darker shade of red, indicating the presence of blood plasma. The cells are moving in a fluid motion, suggesting the action of blood flow. There are no visible titles, subtitles, or text in the video.