title: The role of the umbilical sinus in the regulation of placental vascular resistance.
mesh_terms: D000818:Animals; D001794:Blood Pressure; D002245:Carbon Dioxide / Q000097:blood; D005260:Female; D005333:Fetus / Q000502:physiology; D006503:Hepatic Veins / Q000033:anatomy & histology; D006863:Hydrogen-Ion Concentration; D000860:Hypoxia / Q000503:physiopathology; D008431:Maternal-Fetal Exchange; D010100:Oxygen / Q000097:blood; D010920:Placenta / Q000502:physiology*; D011247:Pregnancy; D012756:Sheep; D014471:Umbilical Veins / Q000502:physiology*; D014655:Vascular Resistance; D014682:Vena Cava, Inferior / Q000033:anatomy & histology
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen