Ductus venosus connects –
Correct Answer: Portal vein and IVC
Description: Ans. is 'c' i.e., Portal vein and IVCFetal circulationo Fetal circulation differs from adult circulation in several ways. Almost all differences are attributable to the fundamental difference in the site of gas exchange.o In the adult gas exchange occurs in the lungs, while in the fetus placenta provides the exchange of gases and nutrients.Course of fetal circulationBlood returing to hearto Blood oxygenated in the placenta returns by way of the umblical vein, which enter the fetus at the umbilicus and course through to join the portal vein,o The ductus venous is a bypass shunt between portal vein and IVC.o Most of the umblical venous blood shunts through the ductus venosus to the IVC.o Blood from IVC (which carries the blood drained from lower extremities, umblical veins, hepatic veins and renal veins) enters the right atrium.o On reaching the right atrium, about l/3rd of total inferior vena caval return of blood enters the left atrium through formen oval.o The rest two third mixes with the venous return from SVC (which carries the blood drained from head, neck and upper limbs) to enter the right ventricles.Blood coming out of the heartRight sideo The right ventricle pumps out the blood into pulmonary trunk -->> very small amount of this blood enters the pulmonary circulation because the lungs are collapsed and pulmonary vascular resistance is high. o Most of this blood passes to desending aorta through ductus arteriosus, a shunt between pulmonary trunk and desending Aorta.o Descending aorta carries blood to umblicus through umblical artery, for oxygenation,o Descending aorta also supplies the blood to lower lumbs, kidney and abdominal viscera.Left sideo The left ventricle pumps blood into the ascending aorta for distribution in coronary' circulation, head and upper limbs.
Category:
Anatomy
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