Fractals in Physiology 

“The heart is filled with fractal networks - in the coronary arteries and veins the fibers binding the valves to the heart wall, the cardiac muscles themselves.”

These fractal systems act to protect against injury - and are the key characteristic to the circulatory system - holding the entire structure together despite the strength of pumping. They are the basis for the structure of the lungs. Fractals allow us to live.