Pulmonary Circulation
The circulation of the blood through the lungs.
See also: How Blood Circulation Works
About Pulmonary Circulation
Pulmonary circulation transports oxygen-poor blood from the right ventricle to the lungs, where blood picks up a new blood supply. Then it returns the oxygen-rich blood to the left atrium.
NIH – National Cancer Institute
(See the right ventricle and left atrium of the heart in the image below.)