The effect of morphine on vagal inhibition of the heart.
D000818:Animals; D002415:Cats; D006168:Guinea Pigs; D006321:Heart / Q000502:physiology*; D009020:Morphine / Q000494:pharmacology*; D011817:Rabbits; D051381:Rats; D014630:Vagus Nerve / Q000502:physiology*
D009020:Morphine
HEART/physiology; MORPHINE/effects; NERVES, VAGUS/physiology