<prompt> True about umbilical cordContains 2 umbilcal veinsContains 1 umbilical aeryRight umbilical vein disappearLength is 25 - 30 cms  <response>: Right umbilical vein regresses and left umbilical vein is left, umbilical cord has two umbilical aeries and the left umbilical vein. An average umbilical cord is 55cm long with a diameter of 1-2 cm and 11helices Ref: Grays 39ep-210-220 