This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Atrial septal defect. en Figure shows the structure and blood flow inside normal heart Figure shows heart with an atrial septal defect The hole allows oxygenrich blood from the left atrium to mix with oxygenpoor blood from the right atrium National Heart Lung and Blood Institute NIH National Heart Lung and Blood Institute NIH