title: Influence of the removal of external Na on the tonus and drug-induced contraction of the isolated rat rectum, particularly in relation to Ca.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D001464:Barium / Q000494:pharmacology; D002118:Calcium / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009129:Muscle Tonus / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D011188:Potassium / Q000494:pharmacology; D051381:Rats; D012007:Rectum / Q000187:drug effects; D012964:Sodium / Q000494:pharmacology*
chemical_list: D001464:Barium; D012964:Sodium; D000109:Acetylcholine; D011188:Potassium; D002118:Calcium