Umbilical cord has: (A) 2 veins and 1 aery, (B) 1 aery and 1 vein, (C) 2 aeries and 1 vein, (D) 2 aeries and 2 veins
Answer is C. This tube of amnion and the structures within it constitutes the umbilical cord.T his cord contains two umbilical aeries and one umbilical vein. REF HUMAN EMBRYOLOGY; Inderbier singh; Tenth edition; Page 67