Two remnants of fetal structures are observable in the adult heart- the ligamentum arteriosum and the fossa ovalis. the fetal heart structures are called the ductus arteriosus and the foramen ovale, respectively. what common purpose did they serve as functioning fetal structures? a. they allowed blood to bypass the non-functional fetal lungs. b. they supplied blood to the immature fetal heart muscle. c. they provided support the the delicate tissues of the developing heart. d. they received maternal blood from the umbilical cord.
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