Healthy veins and diseased veins look distinctly different. Diseased veins are characterized by malfunctioning vein valves, which you can see allow blood to flow in the opposite direction than it should. Healthy veins, however, have strong vein valves that allow for proper blood flow.
https://www.youtube.com/watch?v=z5huqFcql2c
업로드한 게시물은 새로 만든 앨범으로 이동됩니다. 나중에 이 앨범을 편집하려면 계정 만들기 또는 로그인 해야합니다.