A+ is developed and maintained by leading IT experts. Content for the exams stems from a combination of industry-wide survey feedback and contributions from our team of subject matter experts. Learn more about the people behind the CompTIA A+ exam development and the CompTIA A+ Advisory Committee.
Coarctation of the aorta, or aortic narrowing (abbreviated as CoA), is a congenital condition whereby the aorta narrows in the area where the ductus arteriosus (ligamentum arteriosum after regression) inserts.: Coarctation (narrowing) of the aorta. 1:Inferior vena cava, 2:Right pulmonary veins, 3: Right pulmonary artery, 4:Superior vena cava, 5:Left pulmonary artery, 6:Left pulmonary veins, 7:Right ventricle, 8:Left ventricle, 9:Pulmonary artery, 10:Aorta.
Placental abruption is the premature separation of a placenta from its implantation site in the uterus. Within the placenta are many blood vessels that allow the transfer of nutrients to the fetus from the mother.If the placenta begins to detach during pregnancy, there is bleeding from these vessels.lacental abruption is the premature separation of a placenta from its implantation site in the uterus. Within the placenta are many blood vessels that allow the transfer of nutrients to the fetus from the mother.