Pulmonary circulation
Pulmonary circulation is the half of the cardiovascular system that carries oxygen-depleted blood away from the heart to the lungs and returns oxygenated blood back to the heart.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Illu pulmonary circuit."
http://en.wikipedia.org/wiki/File:Illu_pulmonary_circuit.jpg
Wikipedia
Public domain.
