Hydrogel (image) University of California - San Diego Caption Cardiac tissue is liquefied into a fluid that can be easily injected into the heart. Once it hits body temperature, the liquid turns into a semi-solid, porous gel that forms a scaffold to encourage cells to repopulate areas of the heart damaged by heart attack. Credit UC San Diego Jacobs School of Engineering Usage Restrictions None 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.