Herz-Kreislauf-System
<ul><li><a href="//commons.wikimedia.org/wiki/File:A-kreislauf01.jpg" title="File:A-kreislauf01.jpg">A-kreislauf01.jpg</a>: Jörg Rittmeister</li>
<li>derivative work: Vezixig</li></ul>
CC BY-SA 3.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:A-kreislauf01.jpg" title="File:A-kreislauf01.jpg">A-kreislauf01.jpg</a></li></ul>