Before preparing a teaching plan for the parents of an infant with patent ductus arteriosus, it is important that the nurse understands this condition. Which statement best describes patent ductus arteriosus?A. Patent ductus arteriosus involves a defect that results in a right-to-left shunting of blood in the heart. B. Patent ductus arteriosus involves a defect in which the fetal shunt between the aorta and the pulmonary artery fails to close. C. Patent ductus arteriosus is a stenotic lesion that must be surgically corrected at birth. D. Patent ductus arteriosus causes an abnormal opening between the four chambers of the heart.

B. Patent ductus arteriosus involves a defect in which the fetal shunt between the aorta and the pulmonary artery fails to close.

Explanation:

Ductus arteriosus is an artery that is function only during fetal stage. It bypasses the non-functional fluid filled lungs while taking flood from the right ventricle . It joins the pulmonary artery to the descending aorta. Normally this artery closes after birth.

If it fails to close then it results in patent ductus arteriousus that causes abnormal blood flow and a part of oxygenated blood flows back into the pulmonary artery from aorta.

a: the sheep and waste material both release carbon into the atmosphere.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.