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Introduction to Blood Vessels

19. The Blood Vessels / Introduction to Blood Vessels / Problem 4

Which of the following is not true based on the cardiovascular changes at birth?

A

The umbilical vessels degenerate and become fibrous cords.

B

Rising O₂ levels lead to the constriction of the ductus arteriosus.

C

The expansion of the lungs results in a sudden decline in resistance in the pulmonary circuit.

D

The fossa ovalis marks the site of the ductus arteriosus in adults.

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