Back in 2007, Flickr user Rob Jones took a photo of the wonderfully intricate mess of veins and capillaries in a porcine heart. With its four chambers and four valves, a pig’s heart is similar to a human one and blood flows through it in a similar way to a human’s.
The image show a porcine heart where the blood was replaced with a plastic substance, and when the tissues surrounding the heart was dissolved, all that remained was the detailed vascular system. Have a look at the full image after the jump.