DR. OZ
'(<a href="http://www.j-archive.com/media/2009-09-25_DJ_14.jpg" target="_blank">Dr. Oz holds a heart.</a>)  <a href="http://www.j-archive.com/media/2009-09-25_DJ_14a.jpg" target="_blank">This</a> valve, which prevents the backflow of blood from the left ventricle to the left atrium, is named after the pope's hat'
the mitral valve