A nurse's handbook of obstetrics . thelungs, where it gives up its waste products and takes on a freshsupply of oxygen. After oxygenation the so-called arterial bloodflows from the lungs, through the pulmonary vein to the leftauricle, thence to the left ventricle, and out through the aorta,to be distributed to all parts of the body and eventually collected,as venous blood, in the two venae cavae and discharged again intothe right auricle (Fig. 28). In the foetus there are certain structures necessary to theperformance of fetal circulation, but of no use after respirationhas commenced and the f
A nurse's handbook of obstetrics . thelungs, where it gives up its waste products and takes on a freshsupply of oxygen. After oxygenation the so-called arterial bloodflows from the lungs, through the pulmonary vein to the leftauricle, thence to the left ventricle, and out through the aorta,to be distributed to all parts of the body and eventually collected,as venous blood, in the two venae cavae and discharged again intothe right auricle (Fig. 28). In the foetus there are certain structures necessary to theperformance of fetal circulation, but of no use after respirationhas commenced and the flow of blood through the umbilical andplacental vessels has ceased. Consequently these structures areabandoned as soon as the child cries, and shortly after birththey either disappear entirely or are converted into fibrous cords,and remain in after life as fetal structures only. The most important of these, and the one that must closepromptly and effectually at birth if the child is to live for any A NURSES HANDBOOK OF
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