title: Seasonal variations in the reactivity of blood vessels of the frog.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D001001:Anura; D001626:Bethanechol Compounds / Q000494:pharmacology; D001808:Blood Vessels / Q000187:drug effects*; D002217:Carbachol / Q000494:pharmacology; D004246:Dimethylphenylpiperazinium Iodide / Q000494:pharmacology; D004837:Epinephrine / Q000494:pharmacology; D008688:Methacholine Compounds / Q000494:pharmacology; D010830:Physostigmine / Q000494:pharmacology; D011898:Ranidae; D011941:Receptors, Adrenergic / Q000187:drug effects; D012621:Seasons; D014439:Tyramine / Q000494:pharmacology; D014662:Vasoconstrictor Agents / Q000494:pharmacology*
chemical_list: D001626:Bethanechol Compounds; D008688:Methacholine Compounds; D011941:Receptors, Adrenergic; D014662:Vasoconstrictor Agents; D004246:Dimethylphenylpiperazinium Iodide; D002217:Carbachol; D010830:Physostigmine; D000109:Acetylcholine; D014439:Tyramine; D004837:Epinephrine