HTHSCI 1H06 Lecture Notes - Lecture 1: Portal Vein, Umbilical Vein, Umbilical Artery
3 Feb 2020
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Document Summary
Outline the general structure (anatomical organization) of the two circuits that comprise the normal adult circulatory system. Indicate where, in each circuit, oxygen levels are highest/lowest and where carbon dioxide levels are highest/lowest. Several structures are found only in the fetal circulation. What role do they play: the exchange of materials between fetal and maternal circulation occurs through the placenta which attaches to the fetus by the umbilical cord. Blood passes from the fetus to the placenta via 2 umbilical arteries. At the placenta, fetal blood picks up o2. The oxygenated blood returns from the placenta via a single umbilical vein. This vein ascends to the liver of the fetus which is divided into 2 branches. The mixed blood then enters the right atrium. Most of the blood that enters the right atrium passes through the foramen ovale into the left atrium and joins the systemic circulation.
