<prompt> A 3-day-old boy delivered at 32 weeks of gestation is experiencing respiratory distress syndrome. The physician detects a hea murmur characteristic of a patent ductus aeriosus, a diagnosis that is confirmed with an echocardiogram. Which embryonic structure is involved in this diagnosis?Left third aoic archRight third aoic archLeft sixth aoic archUmbilical aeries  <response>: C. Patent ductus aeriosus PDA is a condition in which the ductus aeriosus, a bloodvessel that allows blood to bypass the babys lungs before bih, fails to normally close afterbih. The ductus aeriosus is derived from the distal poion of the left sixth aoic arch 