explain the oxygen-rich blood in the umbilical veins of a human and a pig fetus.

Expert Solution

Lungs of human foetus are non-functional hence the exchange of gases take place between the maternal blood and foetal blood through the placenta. Foetus is connected to the placenta through the umbilical cord. The umbilical cord contains two arteries (the umbilical arteries) and one vein (umbilical vein) surrounded with Wharton’s jelly. Umbilical vein transports the oxygenated blood and nutrients from the placenta to the foetus whereas umbilical arteries transport oxygen poor blood and waste from the foetus to the placenta. Umbilical vein transports the blood towards the foetal liver and to the inferior vena cava finally the blood reaches to the right atrium. Most of the blood from the right atrium goes to the left atrium through an opening known as foramen ovale. Ductus arteriosus shunt the blood moving to the lung through pulmonary artery into the aortic arch. Blood then goes to the left ventricle and through the aorta to the whole body.

Pig foetus shows the similar kind of blood transport.

gladiator answered 14 hours ago

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