title: Release of acetylcholine by the isolated rat heart atria and its influence on regulation of contractility by rhythm.
mesh_terms: D000109:Acetylcholine / Q000378:metabolism*; D000818:Animals; D004558:Electric Stimulation; D006168:Guinea Pigs; D006339:Heart Rate / Q000502:physiology*; D066298:In Vitro Techniques; D009206:Myocardium / Q000378:metabolism*; D051381:Rats
chemical_list: D000109:Acetylcholine