title: Microcirculation: definition and organization at tissue level.
mesh_terms: D000818:Animals; D002196:Capillaries / Q000033:anatomy & histology; D006801:Humans; D008171:Lung Diseases / Q000503:physiopathology; D008833:Microcirculation / Q000033:anatomy & histology / Q000648:ultrastructure; D009131:Muscle, Smooth, Vascular / Q000648:ultrastructure; D011651:Pulmonary Artery / Q000033:anatomy & histology / Q000648:ultrastructure; D011652:Pulmonary Circulation; D011667:Pulmonary Veins / Q000033:anatomy & histology / Q000648:ultrastructure; D051381:Rats