title: Do precapillary sphincters respond to vasoactive substances in an all-or-none manner?
mesh_terms: D000818:Animals; D002196:Capillaries / Q000187:drug effects*; D002395:Catecholamines / Q000494:pharmacology*; D004298:Dopamine / Q000494:pharmacology; D004837:Epinephrine / Q000494:pharmacology; D005260:Female; D008297:Male; D008643:Mesentery / Q000098:blood supply; D008833:Microcirculation / Q000187:drug effects*; D008853:Microscopy; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects* / Q000502:physiology; D009638:Norepinephrine / Q000494:pharmacology; D051381:Rats; D013690:Television
chemical_list: D002395:Catecholamines; D004298:Dopamine; D009638:Norepinephrine; D004837:Epinephrine