Circulatory Memes

What appears to be a cross-section of some elaborate plumbing system is apparently "the human body." Clearly someone skipped anatomy class and picked up a hardware catalog instead. The human circulatory system is complex, but I'm fairly certain we don't have perfectly symmetrical pipes arranged in a cylindrical formation. Though it would make cardiovascular surgery much more straightforward if we did. Next time your doctor orders an X-ray, just hand them this and say "I've saved you some time."