True about valves in poal venous system?
The whole system is valveless Venous valves help in unidirectional blood flow in veinsThe number of valves is greatest below the knee and decrease in number in the more proximal veins.Valveless veins or venous sytem are- Inferior vena Cava- Common iliac veins- Poal venous system- Cranial sinuses
Present at the junction of superior mesentric aery with the splenic aery
Within the poal vein only
The whole system is valveless
In the intrahepatic poion of poal vein.