Final answer:
Transposition of the great vessels is a congenital heart defect where the aorta and the pulmonary artery are switched in position.
Step-by-step explanation:
Transposition of the great vessels is a congenital heart defect where the aorta and the pulmonary artery are switched in position. In this condition, the aorta arises from the right ventricle instead of the left ventricle, and the pulmonary artery arises from the left ventricle instead of the right ventricle. As a result, oxygenated blood is recirculated to the lungs instead of being pumped to the body.
This condition can lead to serious complications and requires surgical intervention shortly after birth to correct the abnormal circulation.