Blood flowing through umbilical vein of mammalian
embryo is
(1) 100% foetal (deoxygenated)
(2) 50% maternal (oxygenated) + 50% foetal
(3) 50% maternal (deoxygenated) + 50% foetal
(4) 100% foetal (oxygenated)

Blood flowing in mammalian umblical cord is 100% foetal (deoxygenated). Umblical cord is an exception where arteries carry deoxygenated blood and veins carry the oxygenated blood (other exception is pulmonary vein and pulmonary artery). Hence, umblical vein carries nutrient rich, oxygenated blood towards the heart of the fetus whereas umblical artery carries deoxygenated blood away from the heart.

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answer given was this but I could not get that areteries take blood away from heart so why it is de oxygenated
Umbilical cord consist 2 umbilical arteries
(Deoxygenated blood) and 1 umbilical vein
(oxygenated blood) in which 100% foetal blood
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