Dig into the science of how heart transplants happen, how donors are matched and find out how this complex surgery saves lives. -- Your heart beats more than 100,000 times a day. In just a minute, it pumps over five liters of blood throughout your body. But unlike skin and bones, the heart has a limited ability to repair itself. So if this organ is severely damaged, there’s often only one medical solution: replacing it. Roni Shanoada explores how this complex and intricate procedure works. Lesson by Roni Shanoada, directed by Alexia Roider, Zedem Media.