| Front | Prenatal circulation |
|---|---|
| Back | Mechanism: involves two pathways that intersect at the right atrium. For more highly oxygenated blood: 1. Oxygenate blood enters the fetus via the umbilical vein and joins deoxygenated blood from the lower half of the fetus. 2. Blood flows into IVC and enters right atrium 3. Blood is shunted into the left atrium through the foramen ovale 4. Blood goes into left ventricle 5. Blood exits through the aorta and brings oxygenated blood to upper half of body For highly deoxygenated blood: 1. Blood from upper half of body enters SVC into right atrium. 2. Blood goes through tricuspid valve into right ventricle 3. Blood exits through pulmonary valve into pulmonary trunk 4. Most blood is shunted away from the lungs through the ductus arteriosus to the aorta 5. Blood goes to lower half of fetus before returning to placenta. Function: exchange and distribution of oxygenated blood from the placenta to the fetal body, bypasses the non-functional lungs. |
Tags: cardiovascular
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