True about fetal circulation-
Correct Answer: Hea receives blood with high oxygen saturation
Description: Ans. is 'd' i.e., Hea receives blood with high oxygen saturation o Blood in IVC has more saturation than blood in SVC as IVC carries the oxygenated blood of umblical vein. o The left ventricular blood has more oxygen saturation that right ventricular blood because it carries the blood of IVC, while blood in right ventricle is a mixture of blood from IVC and SVC. o So, the brain and coronary circulation receive blood with higher saturation (through ascending aoa) than the lower half of body. o The left ventricular output is approximately half of right ventricular output because volume of blood reaching in left atrium is considerably lower than volume of blood reaching in right atrium. Infact right atrium is the major source of blood to left atrium. o Aoa and pulmonary trunk are connected by ductus aeriosis, and pulmonary trunk has pressure slightly higher or equal to that of arota --> So, blood flows from pulmonary trunk to aoa. o The pressure in right and left ventricles are equal.
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Pediatrics
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