500
I'm blood coming from your big toe during a morning walk, explain how I will become oxygenated and get back to your big toe to continue the walk.
Inf. v cava, rt atrium, tricuspid valve., rt ventricle, pulm. valve., pulm. artery, lung, co2 aveoli, o2 mix w/ blood in caps, pulm. vein, lt atrium, mitral valve, lt ventricle, aortic valve, aorta, artery back to big toe