HTHSCI 1CC6 Chapter Notes - Chapter 22: Bohr Effect, Perfusion, Erythropoietin
5 Dec 2017
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Cardiogenesis is the development of the heart in the embryo. The umbilical cord: 1 vein carries oxygen and nutrient rich blood from the placenta to the fetus, 2 arteries carry waste away from the fetus to the placenta for exchange. The vascular shunts: ductus venosus - by passes the liver sinusoids, both the hepatic portal vein and the ductus venosus empty into the inferior vena cava. As a fetus, the mother"s liver performs most of these functions and when baby is born it takes over and ductus venosus closes. Turns into the ductus venosus: foramen ovale blood entering the right atrium is shunted into the left atrium through the foramen ovale, which is a flap of tissue. Turns into the fossa ovalis: ductus arteriosus transfers blood from right ventricle directly up into the aorta, again by passing the pulmonary circuit. Hemoglobin is an oxygen carrying protein, made up of 4 portein chains, heme group contains iron.
