title: Quantitative effects of external calcium concentration on contraction of rat portal vein compared to thoracic aorta.
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects*; D002118:Calcium / Q000494:pharmacology*; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D011169:Portal Vein / Q000187:drug effects*; D051381:Rats
chemical_list: D002118:Calcium; D009638:Norepinephrine