| − | An atrium is a [[heart]] chamber which receives [[blood]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> | + | An '''atrium''' is a chamber of the [[heart]] which receives [[blood]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> |