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Describe two major changes that happen in a placental mammal’s circulatory system at birth. Specifically, for...

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Medical Sciences

  1. Describe two major changes that happen in a placental mammal’scirculatory system at birth. Specifically, for each change describethe feature in the prenatal animal, the change that happens atbirth, and the feature in the postnatal animal.

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CHANGES IN CIRCULATORY SYSTEM AT THE TIME OF BIRTH 1 Foremen ovale is closed as the lungs become functional 2 Ductus venosus is constricted and the ductus arteriosus is closed 3 Not so important change placental vessels are occluded 1FORAMEN OVALE FEATURE IN PRENATAL ANIMAL Foramen ovale allows most of the oxygenated blood entering the right atrium from inferior venacava to pass into the left atrium It prevents passage of blood in opposite direction because the septum primum closes against    See Answer
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