Pulmonary veins are blood vessels that transport blood from the lungs to the heart[GO].
Comment:
[homology-note] "On the other hand, in the sister clade of the actinopterygians, the sarcopterygians, the gill circulation is supplemented with lung ventilation. As a result, the pulmonary artery and vein and a functional ductus arteriosus arose as a major evolutionary innovation from the sixth arch, giving the organism a flexible shunt to balance blood supply to and from gills and lungs according to environmental conditions.[well established][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0001133", ontology="VHOG", source="ISBN:978-0030223693 Liem KF, Bemis WE, Walker WF, Grande L, Functional Anatomy of the Vertebrates: An Evolutionary Perspective (2001) p.620", source="http://bgee.unil.ch/"}