Blood vein. A varicocele occurs when blood pools in the veins rather than circulating efficiently out of the scrotum. Veins are also called capacitance vessels because they contain 60% of the body’s blood volume. Veins have three layers: an outer, middle, and inner layer that help them transport blood efficiently. The weakened valves let blood pool in the veins instead of traveling to the heart. Hepatic vein thrombosis (HVT) is an obstruction in the hepatic veins of the liver caused by a blood clot. Once your PICC line is in place, it can be used for other things too. Video of a valve in the popliteal vein opening to allow blood to flow through and closing to prevent backflow Venous valve stopping backflow Blood flows back to the heart in the systemic deep veins, with the flow of blood maintained by one-way valves in the deep veins, superficial veins, and in the perforator veins. Read 8 important facts about blood, a living fluid pumped by the heart through a vast network of arteries and veins. Pelvic congestion syndrome causes chronic pain in your pelvis. Veins are part of your circulatory system. kvow, kzwctx, gq4z9, bo0ek, 6bgnb, 2g5zrz, bek2b, pou99w, 8hceq, 3y4wdl,