Heart Flow (VIDEO) Johns Hopkins Medicine This video is under embargo. Please login to access this video. Caption This video shows the trajectory of blood flowing into the left atrium from the pulmonary veins. Credit Hiroshi Ashikaga Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.