I found this picture in the lovely seventh edition Campbell and Reese Biology Book.
I'm analyzing this picture, trying to connect it to the text and reading all about the circulatory system. Must have been the longest paragraph of confusing stuff I've read all night. Blood goes to heart through arteries, out through veins, first through the pulmo(something), then the (something) circuit.....then they've lost me.
I looked a little closer and suddenly it hit me! At first glance you might think its the human cardiovascular system, but NO! It is actually the Georgia Tech Stinger routes. See the first time around is in the morning when driver Mr. Peel is in a good mood and he's like "Wow, so many kids to pick up. I'll have to hurry through the campus to pick them up." But then second time around, it's at night and Mr. Peel is tired, so he takes a longer time to go around once. Do have a look!
As you can see here, the heart is West Campus and the aorta is the Hemphill to Ferst street route. Caldwell is the right atrium. If you're tired and don't want to wait as long for the stinger, you can wait at the capillaries to increase your chances of catching either the blue or red route. You can take the pulmocutaneopus circuit to get to where you want to go faster.
And.... once again, I just wasted a precious hour when I could have been learning about plant nutrition. =(