The video shows a close-up of a blood vessel with red blood cells flowing through it. The blood cells are circular and have a biconcave shape, which allows them to be flexible and change shape as they move. The blood vessel walls are smooth and appear to be made of a soft tissue. The video is shot in a way that gives the viewer a sense of being inside the blood vessel, looking out at the blood cells as they move. The lighting is dim, and the colors are mostly shades of red and pink, which are typical of blood. There is no visible title, subtitle, or other text in the video.