Mesh : Acetylcholine / pharmacology Aminobenzoates / pharmacology Amyl Nitrite / pharmacology Angiotensin II / pharmacology Animals Atropine / pharmacology Bradykinin / pharmacology Carbachol / pharmacology Dogs Epinephrine / pharmacology Fibrinolytic Agents / pharmacology Haplorhini Humans Metformin / pharmacology Nicotinic Acids / pharmacology Norepinephrine / pharmacology Oxytocin / pharmacology Phenformin / pharmacology Pituitary Hormones, Posterior / pharmacology Procaine / pharmacology Rats Reserpine / pharmacology Tyramine / pharmacology Vasopressins / pharmacology Vitamin A / pharmacology