title: Effects of caffeine on the membrane potentials and contractility of the guinea pig atrium.
mesh_terms: D000200:Action Potentials / Q000187:drug effects*; D000818:Animals; D002110:Caffeine / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology; D003864:Depression, Chemical; D006168:Guinea Pigs; D006325:Heart Atria; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects*; D009119:Muscle Contraction / Q000187:drug effects*; D010210:Papillary Muscles / Q000187:drug effects / Q000502:physiology*
chemical_list: D002110:Caffeine; D002118:Calcium