By Arnab Banerjee WATCH RELATED VIDEO Submit The heart is one of the most important parts of our body and the heartbeat is one of the major fundamental processes. Scientists are now doing research on how blood gets filled up in the heart. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.